Current status, 14 January 2011:
At the moment, I stand by my original claim that you shouldn't use SBC until we all know more, but I can't state that the kernel is unilaterally safe or unsafe at this point. There are legitimate claims in this thread that holding the battery at 4.2V can cause an eventual short in the battery, which could lead to a catastrophic failure. MS and I are in touch. Once I have more skilled EE's to help me, we are going to review everything and make some recommendations. This might involve upfront testing or it might not, as dictated by what we find in our first reviews. I will try to keep this up to date, but be aware it might not move as quickly as you like.
Original Post:
Let me preface this by saying I am a degreed electrical engineer and I specialized in integrated circuit design. I am slightly out of practice, but the fundamentals don't change much. I am not an expert on batteries, but I understand the basics of their operation. I will absolutely yield to the engineering experience of people that have devoted significant portions of their careers to the field of battery design and applications. However, I don't think we have many of those people running around here.
This is a long post, as the topic material requires. If you don't read it all, you won't understand what is going on.
I started out this adventure reading this thread:
http://forum.xda-developers.com/showthread.php?t=876590
Will this damage my battery?
This charging method doesnt damage the batteries at all. It shouldnt. Because our batteries dont even charge up to 4.2V without the tweak. They charge up to 4.2V the first charge, then drop all the way down to 4.08V or something and then does these weird short burst chargers to 4.1-4.125V. Thats why there's the rapid drop in the morning. Because your voltage is actually at 4.125V and that's not 100%. So with this tweak, the charger keeps charging until you're at 4.2V (or the maximum voltage your battery can get to) and then it trickle chargers while at that voltage. The charger itself never turns off. Thats not a bad thing. Because as you reach your actual voltage, the mA decreases. Which is why our phones will never be damaged. You ever want to know why its really easy to charge from 50-80% but the charge from 90-100% seems to take so long? Its because from 50% the mA going into the phone is in the 600's. Once it reaches 90%, the mA is around 150 and once it reaches 95% you're looking at 90mA. The phone when absolutely idle uses anywhere from 60-120mA, even when on the charger. So charging from 90% to 100% takes longer becaus the mA going into the phone isnt always higher than the mA you're losing. This is the same with charging past 100%. As you leave the phone on the charger with this tweak, you're mA will decrease from 50mA all the way down to 2mA overnight. But on the charger you're losing about 30-60mA already, so you'll never overcharge the battery, in best case scenarios, you'll just maintain the voltage of 4.2 or around 4.2V.
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Click to collapse
Quite frankly, this explanation shows a clear lack of understanding of battery fundamentals and perhaps even the basics of electricity. So I read the thread linked in the above post and got a clearer explanation of SBC kernels.
http://forum.xda-developers.com/showthread.php?t=894880
SBC is a type of "trickle" charging. It's a full, slow, complete charge and it prevents the 10% drop that most users get when pulling the phone off the charger. This kernel performs best with an overnight charge. Some users asked questions on the safety of the SBC charging method. Ms79723 states that it slowly pushes mV into the battery and thus keeps the battery cool. SBC kernels push the battery past their normal 100% charged point, to a TRUE 100% charged battery. These kernels also charge extended batteries to their maximum and show true "on charger" voltages, which would deem these to be more accurate for checking voltages on your battery. There was and still are concerns of the SBC kernels destroying your battery, but to most people now these dont pose much concern anymore.
The issues people were bring up is that the Li-Ion batteries are charged to the point HTC set them to was for safety of the battery. Li-Ion's can be unstable at times, but Ms79723 programmed safety temperature and voltage "stops" to kill the charging is they get too high. Bad things can start to form, I said can not will, if the temperature gets above 140f and voltage gets to or past 4230mV. If the mV gets to 4230mV it can causes issues. If it gets to 4300 mV it can cause plating. People are also speculating that the SBC kernels are going to kill your battery and or shorten the life. With the price of eBay batteries now days, if the SBC kernels give you drastically ( which has been seen ) more battery life, then why not? The highest seem on the SBC kernels is 4210mV, which is under both values for issues to start.
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Now, let me explain what a trickle charger actually does. Basically, at the end of the charging cycle, you change over to a constant current source (CCS) supply. This means in a true trickle charger, IT WILL CHANGE THE VOLTAGE TO (theoretically) ANY VALUE TO MAINTAIN A CONSTANT CURRENT! That is bad for a Li-ion battery because they react poorly to being overcharged (see the end of this post for an explanation of battery charging and voltage). If you increase the supply voltage beyond the battery voltage, you are guaranteed to overcharge the battery. Check it out:
http://www.mpoweruk.com/chargers.htm#trickle
Trickle charge Trickle charging is designed to compensate for the self discharge of the battery. Continuous charge. Long term constant current charging for standby use. The charge rate varies according to the frequency of discharge. Not suitable for some battery chemistries, e.g. NiMH and Lithium, which are susceptible to damage from overcharging. In some applications the charger is designed to switch to trickle charging when the battery is fully charged.
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What about the self-discharge of our Li-ion you say? Well, Li-ions have some of the lowest internal resistances out there, so they barely discharge themselves at all.
Well, why does my battery lose about 10% everytime I unplug it using the stock charging kernels? That seems like bad engineering! It isn't. It is an engineering decision.
http://www.mpoweruk.com/lithiumS.htm#charging
Charging Lithium Batteries
Should be charged regularly.
The cell voltage is typically 4.2 Volts
Battery lasts longer with partial charges rather than full charges.
Charging to 4.1 Volts will increase the cycle life but reduces the effective cell capacity by about 10%.
Can not tolerate overcharging and hence should not be trickle charged.
Charging method: Constant Current - Constant Voltage .
Fast chargers typically operate during the constant current charging phase only when the charging current is at a maximum. They switch off at the point when the constant voltage, reducing current phase starts. At this point the battery will only be charged to about 70% of its capacity.
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The experience of battery engineers and device designers has shown them that they can ignore the top ~10% of battery capacity and dramatically increase the cycle life of the battery. That means you can charge and discharge the battery many more times before the actual capacity (power) of the battery drops to 80% of its original maximum. For most people, this is a great tradeoff. But it is not bad engineering. At the very least, it is a bad design decision for some people.
Now, you might be asking yourself why it charges so quickly to ~70% then takes forever to get to the ~90% level. The explanation given by MS79723 makes so much sense you say. Let's debunk it a little bit.
http://www.mpoweruk.com/chargers.htm#cccv
Constant-current Constant-voltage controlled charge system. Used for charging Lithium batteries which are vulnerable to damage if the upper voltage limit is exceeded. Special precautions are needed to ensure the battery is fully charged while at the same time avoiding overcharging. For this reason it is recommended that the charging method switches to constant voltage before the cell voltage reaches its upper limit.
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The charge voltage rises rapidly to the cell upper voltage limit and is subsequently maintained at that level. As the charge approaches completion the current decreases to a trickle charge. Cut off occurs when a predetermined minimum current point, which indicates a full charge, has been reached. Used for Lithium and SLA batteries. See also Lithium Batteries - Charging and Battery Manufacturing - Formation.
Note: When Fast Charging rates are specified, they usually refer to the constant current period. Depending on the cell chemistry this period could be between 60% and 80% of the time to full charge. These rates should not be extrapolated to estimate the time to fully charge the battery because the charging rate tails off quickly during the constant voltage period.
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The reason the charger switches from a constant current source (CCS) to a constant voltage source (CVS) is nestled in a few engineering details. Much like the opposite of a CCS, a CVS will (theoretically) provide any current required to maintain a constant voltage supply. Now, you can approximate the battery as if it were a simple capacitor. This is not true universally, but it works for this explanation. We have already established that Li-Ion batteries respond very poorly to overcharging. Overcharging means putting too many units of charge into the battery, which can be measured by an excessive voltage on the battery. If you have had engineering physics, you know that if you place a constant voltage in series with a capacitor, it is physically not possible for the voltage on that capacitor to ever exceed the voltage of the CVS, but it may take a long time for the capacitor to reach that voltage. So we have built in safety and much more precision, but it takes longer to charge this way. (If you want to know more about this, you should study up on the mobility of electrons and holes in solid state devices.)
By now, you should be starting to see some similarities to things you observe, but the explanations clearly do not match what others have offered. So, I have to propose a couple of conclusions. If someone doesn't want to sacrifice the last 10% of capacity on each charge cycle to increase their cycle life, they could conceivably modify the kernel to allow charging at the higher ~4.2V as a CVS. Maybe that is what MS79723 is doing, but I really highly doubt it considering how people are going for hours and only using the top 10% of their battery life. That smells like serious overcharging, which is what would occur in a true trickle charge system. So I would like some clarification from the people putting out the SBC kernels. What charging methods are they ACTUALLY using? How are they controlling them? Do they have an appreciation and deep understanding of the above principles? If they don't have good answers, I would highly recommend you discontinue use of their kernels immediately.
And one more thing folks. There are no panaceas in deployed hardware. Only engineering decisions.
Very well said, and thank you! Must of us wouldn't have even thought twice about the sbc kernels cause of what they offered. More battery life! Thus in turn it's doing more harm than good.
Folks, face it. We are basically carrying around mini mini laptops. These phones come eqquiped with 1ghz processors. Nice vibrant screens, the works. They were made to chew through battery life. If the sbc kernels are doing harm, then count me out.
Sent from my PC36100 using XDA App
quickbird144 said:
Very well said, and thank you! Must of us wouldn't have even thought twice about the sbc kernels cause of what they offered. More battery life! Thus in turn it's doing more harm than good.
Folks, face it. We are basically carrying around mini mini laptops. These phones come eqquiped with 1ghz processors. Nice vibrant screens, the works. They were made to chew through battery life. If the sbc kernels are doing harm, then count me out.
Sent from my PC36100 using XDA App
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I should point out that based on what the developers have said and the performance people are reporting, it seems likely that they are overcharging the batteries. However, that is all pending us getting some hard answers from the developers.
I would like to further add that no matter the method you use, if you are able to reliably charge your battery to the exact rated voltage (not give up the 10% capacity) then you are much more likely operating it safely. It is something I would personally be comfortable with, pending the input of an actual battery applications engineer. HOWEVER, I AM NOT A PE and I DO NOT HAVE A STAMP. I AM NOT YOUR EE DESIGN CONSULTANT AND IF YOU DO THAT AND IT STILL BLOWS UP, IT IS NOT MY FAULT.
Of course, the most accurate and reliable way to charge to that level would be using the scheme used in the stock kernel, but raising the maximum voltage to the rated voltage of the battery.
Just saw a thread on a few peoples evos that did have the sbc kernel, blew up. I'm now on htc's kernel #15
Sent from my PC36100 using XDA App
Thanks for this post, and IMO this info should be obvious to even a non-engineer. These are the reasons exactly why I have never once even been tempted to try these kernels. The reason for the charging policy set by HTC in the stock kernels is similar to the reason the bartender never fills your drink up to the rim -- it's likely to overflow and make a mess.
I should also point out that rereading my first quote of MS79723 shows a clear contradiction in his explanation. He says they are using a trickle charger, but he is describing a constant voltage scheme. MS, please clarify exactly what you guys are doing so the engineers here can provide input.
I dont deny facts are there, I dont overlook them. I will continue to use SBC kernels because I like the battery life "now" not longevity, I wont have this phone long enough for the battery to be rendered useless by charging and if I do then I wont second thought purchasing another battery.
thank you for the very informative post, im positive it answers lots of questions that many have about SBC kernels affecting battery longevity
you can tell smokers that cigarettes cause cancer but it wont stop many of them, ms has given an option to those that so desire the absolute most out of their batterys at a cost of longevity and I appreciate that.
there is still no proof of how much SBC shortens battery life or how quickly, my battery has been using SBC kernels since testing periods along with a few others and I or them have yet to experience reduced battery life. I will report if ever my battery has less than expected life and I do carry a new unopened backup for if that day comes
raiderinks said:
And one more thing folks. There are no panaceas in deployed hardware. Only engineering decisions.
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Remember the FPS fix created by the developers on these forums?
|Jason8| said:
Remember the FPS fix created by the developers on these forums?
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Charging a battery is driven by device physics, not software. You can't abstract yourself away from the fact that a battery is a fundamental device that behaves according to the laws of physics and those laws direct us to only a few safe methods for charging. Without some legitimate answers and clarifications from the developers, there is a clear and real danger that you are overcharging your battery every single day. Furthermore, heat is not the only way to tell that a battery is overcharged. That is how you tell it is overcharged to a critical failure point.
Now, I don't doubt the merits and the tremendous skill of the developers on these forums. In fact, I have been partaking in their efforts since the PPC6700. However, this is an area that ***NEEDS*** clarification because it is putting people and property at risk if done improperly.
raiderinks said:
I should also point out that rereading my first quote of MS79723 shows a clear contradiction in his explanation. He says they are using a trickle charger, but he is describing a constant voltage scheme. MS, please clarify exactly what you guys are doing so the engineers here can provide input.
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Question: if I'm using this tweaked kernel and my battery never goes above 4.2 v does that mean it is not being overcharged? Because that's what I observe. It charges to 4.2 v and stays there with 0 mA, no matter how long it is on the charger. Does this not indicate that it is working as designed?
Sent from my PC36100 using XDA App
you would be better suited to get a response if you PM'd him directly instead of asking him a question in a thread you started. What you say may be true seeing as you have more formal instruction on the matter however what is clearly obvious where as much command you have in the other arena you posses the exact opposite in the development cycle. Also, all of his information is posted online in his github which he clearly links to in his posts would probably be an excellent starting point to gain additional perspective before continuing your research.
raiderinks said:
I should also point out that rereading my first quote of MS79723 shows a clear contradiction in his explanation. He says they are using a trickle charger, but he is describing a constant voltage scheme. MS, please clarify exactly what you guys are doing so the engineers here can provide input.
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matt2053 said:
Question: if I'm using this tweaked kernel and my battery never goes above 4.2 v does that mean it is not being overcharged? Because that's what I observe. It charges to 4.2 v and stays there with 0 mA, no matter how long it is on the charger. Does this not indicate that it is working as designed?
Sent from my PC36100 using XDA App
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That depends entirely on the reliability of the voltage measurements. If we assume that they are flawless measurements, then it would suggest that your battery is not being overcharged. However, I have no idea what kind of error exists in the onboard measurement devices, if they register false values outside of an operable range, etc.
xlGmanlx said:
you would be better suited to get a response if you PM'd him directly instead of asking him a question in a thread you started. What you say may be true seeing as you have more formal instruction on the matter however what is clearly obvious where as much command you have in the other arena you posses the exact opposite in the development cycle. Also, all of his information is posted online in his github which he clearly links to in his posts would probably be an excellent starting point to gain additional perspective before continuing your research.
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I didn't know he had linked his github page. Looking him up now.
Ok.... that was all very hi techy and you sound as if you are very educated and know what youre talking about. Means very little to me as a user. What do I look for as a user? My batt life is noticeably better on the sbc kernel. Its not over heating in the least, in fact Id go as far as to say its cooler now on the charger than when I was using the stock HTC kernel, and I have my phone on the charger a lot. Id consider myself a power user for sure. Ive been using different apps to monitor mA's and I can say that when my batt reaches full charge the mA's the batt is absorbing (0-2) are far less than what the phone is using even when just sleeping. So how could the batt be getting over charged? How would I know? I know it cant be sustaining a full charge the entire time its on the charger as long as the phone is on, simple mathematics tell me this, right? This is what Ive gotten from all that Ive read on this, please correct me where ever Im wrong and please keep in mind Im no engineer. In order for the batt to sustain damage it needs to take in more mA's than its puttng out for a period of time. Thats how it becomes "overcharged", right? So if I turn my phone with the sbc kernel off, place it on the charger and walk away from it for a day or so... that would result in over charging. Correct or no? Now if I take my phone with the sbc kernel and plug it in to the charger while on and walk away from it for a day its using more mA's than its pulling in... no over charge. No damage to my batt. Yes or no?
raiderinks said:
I should also point out that rereading my first quote of MS79723 shows a clear contradiction in his explanation. He says they are using a trickle charger, but he is describing a constant voltage scheme. MS, please clarify exactly what you guys are doing so the engineers here can provide input.
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My work is on my github and yeah there probably was a contradiction. I pretty much write everything in "one take" so I dont ever go back and re read, I write everything that I'm thinking.
I believe some of the problem is that there were several different SBC Kernals.
When my battery gets to 4200mA, it bounces between 4195-4200 but NEVER exceeds 4200.
This could be looked at the same as overclocking, plays nice with some phones, kills others.
raiderinks said:
I didn't know he had linked his github page. Looking him up now.
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did you even read the whole OP for SBC? its been there since he started
Biggest Fro said:
I believe some of the problem is that there were several different SBC Kernals.
When my battery gets to 4200mA, it bounces between 4195-4200 but NEVER exceeds 4200.
This could be looked at the same as overclocking, plays nice with some phones, kills others.
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Just went through my log for the last 8 days and same as you my highest charge is 4204 (hit this only 2 times).
http://dl.dropbox.com/u/18315605/battery_history.txt
GadgetMonger said:
Ok.... that was all very hi techy and you sound as if you are very educated and know what youre talking about. Means very little to me as a user. What do I look for as a user? My batt life is noticeably better on the sbc kernel. Its not over heating in the least, in fact Id go as far as to say its cooler now on the charger than when I was using the stock HTC kernel, and I have my phone on the charger a lot. Id consider myself a power user for sure. Ive been using different apps to monitor mA's and I can say that when my batt reaches full charge the mA's the batt is absorbing (0-2) are far less than what the phone is using even when just sleeping. So how could the batt be getting over charged? How would I know? I know it cant be sustaining a full charge the entire time its on the charger as long as the phone is on, simple mathematics tell me this, right? This is what Ive gotten from all that Ive read on this, please correct me where ever Im wrong and please keep in mind Im no engineer. In order for the batt to sustain damage it needs to take in more mA's than its puttng out for a period of time. Thats how it becomes "overcharged", right? So if I turn my phone with the sbc kernel off, place it on the charger and walk away from it for a day or so... that would result in over charging. Correct or no? Now if I take my phone with the sbc kernel and plug it in to the charger while on and walk away from it for a day its using more mA's than its pulling in... no over charge. No damage to my batt. Yes or no?
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Exactly my feeling on the matter. the only short term way to damage the battery/phone is temperature. there are a lot of people who dont care about the long term affects on the battery seeing as they are fairly cheap. (most people should replace their batteries after a year anyway).
ms79723 said:
My work is on my github and yeah there probably was a contradiction. I pretty much write everything in "one take" so I dont ever go back and re read, I write everything that I'm thinking.
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Thank you very much for the work you do, i kept up with your post when you first started the project. you were VERY enthusiastic about figuring this out and bringing it to the public. personally i think we need more devs as spirited as you.
Biggest Fro said:
I believe some of the problem is that there were several different SBC Kernals.
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Click to collapse
i believe most people and discussion is related to v7. (at least i hope)
with all this said. since immediate damage is due to temperature of the battery. wouldnt it be easy to add another failsafe in the kernel that would shut off charging if the temperature exceeded a certain amount. i'm no dev, but i wouldn't think that would be very hard. then we could let the end user decide on the risk of prolonged battery degradation.
GadgetMonger said:
Ok.... that was all very hi techy and you sound as if you are very educated and know what youre talking about. Means very little to me as a user. What do I look for as a user? My batt life is noticeably better on the sbc kernel. Its not over heating in the least, in fact Id go as far as to say its cooler now on the charger than when I was using the stock HTC kernel, and I have my phone on the charger a lot. Id consider myself a power user for sure. Ive been using different apps to monitor mA's and I can say that when my batt reaches full charge the mA's the batt is absorbing (0-2) are far less than what the phone is using even when just sleeping. So how could the batt be getting over charged? How would I know? I know it cant be sustaining a full charge the entire time its on the charger as long as the phone is on, simple mathematics tell me this, right? This is what Ive gotten from all that Ive read on this, please correct me where ever Im wrong and please keep in mind Im no engineer. In order for the batt to sustain damage it needs to take in more mA's than its puttng out for a period of time. Thats how it becomes "overcharged", right? So if I turn my phone with the sbc kernel off, place it on the charger and walk away from it for a day or so... that would result in over charging. Correct or no? Now if I take my phone with the sbc kernel and plug it in to the charger while on and walk away from it for a day its using more mA's than its pulling in... no over charge. No damage to my batt. Yes or no?
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Click to collapse
In all of my reading I have found that it is known that holding a Li-ion battery at its max rated voltage is bad for the battery and can have similar effects as overcharging over time. Charging to that point and then stopping the charge is ok.
in one of the threads i read that if you want to know weather your battery is working on full capacity or not you have to get 4.20 to 4.50 V when fully charged
i have been working on that for a couple of days with different builds
but all i got was a number between 4.150 to 4.18
now the big questions is this
how much you dear friend get when your beloved hd2 is fully charged and the snap dragon inside is angry enough?
just post your voltage that you get also any idea is welcomed
I've read 4.3 is what we're after but never get past 4.197, even after clearing battery stats, doesn't seem to be too much of a problem though!
4.2 is the most I ever got on my phone. I've never wiped the battery stats, too afraid now with magldr's charging problems.
From my understanding of lithium ion batteries, they last longer at less than full charge anyway.
You also need to take tolerance into concideration.
The Voltage sensor probably has a couple of % tolerance which can also be influenced by temperature, humidity etc
So I wouldn't worry, or even compare, if one is stuck at max 4.1 to 4.3 Volts.
Fluctuating Charging Voltage
Nice thread. Guys, I need your reply...
I'm designing a portable 4 Ni-MH powered USB charger for my Xperia X8. The peak summing voltage is 5,9V for zero load.
The question:
1. Is 5,9 V tolerable to be the input voltage?
2. What is definitely the 'legal' input voltage tolerance for the X8?
3. Does any recent handset always have built-in voltage regulator to make sure the battery is charged correctly?
Thanks for sharing...
Hi. Someone who had a working phone, can please just tell mr what voltage can it rear with the volt-meter for the battery? I know it should be 3.85, but my battery has only 3.7V, and I don't know if this is the reason for my phone not starting or not. @F.J.V or @tsongming?
D1stRU3T0R said:
Hi. Someone who had a working phone, can please just tell mr what voltage can it rear with the volt-meter for the battery? I know it should be 3.85, but my battery has only 3.7V, and I don't know if this is the reason for my phone not starting or not. @F.J.V or @tsongming?
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Click to collapse
Hi, I did not measure it.
In the back there are two inscriptions, but I do not know what they mean because it is in Chinese, one says 3.85V and another 4.4V, I took a picture but I did not measure it.
I think the voltage should be 3.85 I do not know what 4.4 means
If the correct thing was 3,85 it does not seem to me that 3,7 was very little, the difference is part of the accuracy of the measuring device, so those 150mV may not be exact, anyway, I do not know how much voltage this battery loses in the download state, but I bet it will be more than those 150mV.
Another thing is that the voltage is 4.4V, but I lean more to 3.85V
Greetings.
F.J.V said:
Hi, I did not measure it.
In the back there are two inscriptions, but I do not know what they mean because it is in Chinese, one says 3.85V and another 4.4V, I took a picture but I did not measure it.
I think the voltage should be 3.85 I do not know what 4.4 means
If the correct thing was 3,85 it does not seem to me that 3,7 was very little, the difference is part of the accuracy of the measuring device, so those 150mV may not be exact, anyway, I do not know how much voltage this battery loses in the download state, but I bet it will be more than those 150mV.
Another thing is that the voltage is 4.4V, but I lean more to 3.85V
Greetings.
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Click to collapse
3.85 is the minimum I guess, and that 4.4 is the maximum safe it supports. But... Idk id that 3.85 is the minimum that the battery goes and let the phone to boot or not
D1stRU3T0R said:
3.85 is the minimum I guess, and that 4.4 is the maximum safe it supports. But... Idk id that 3.85 is the minimum that the battery goes and let the phone to boot or not
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Click to collapse
Let's see if someone who understands more than battery voltages can help you.
If you are careful try to charge the battery directly, but be careful, if you pass you can explode.
Ideally, you should do it with a variable voltage source and controlled by an ammeter, so as not to run over the charging current, but if you only have 5V (usb or charger) you can try to charge it a bit by connecting it for two or three seconds, and resting Another four or five seconds, checking the tension from time to time until it passes a little over 3.85V.
Another safest option would be to look for a 3.7V battery charger (it is a voltage common to many li-ion batteries), but if you do not put an ammeter, do it for short periods, although you will not have as many problems as a 5V charger, but maybe it's a bit short, and do not charge the battery a lot.
Eye, if you're not sure do not do anything, as I said the battery may explode. Check that it does not get hot and that it does not inflate and make no mistake with the polarity.
Greetings.
F.J.V said:
Let's see if someone who understands more than battery voltages can help you.
If you are careful try to charge the battery directly, but be careful, if you pass you can explode.
Ideally, you should do it with a variable voltage source and controlled by an ammeter, so as not to run over the charging current, but if you only have 5V (usb or charger) you can try to charge it a bit by connecting it for two or three seconds, and resting Another four or five seconds, checking the tension from time to time until it passes a little over 3.85V.
Another safest option would be to look for a 3.7V battery charger (it is a voltage common to many li-ion batteries), but if you do not put an ammeter, do it for short periods, although you will not have as many problems as a 5V charger, but maybe it's a bit short, and do not charge the battery a lot.
Eye, if you're not sure do not do anything, as I said the battery may explode. Check that it does not get hot and that it does not inflate and make no mistake with the polarity.
Greetings.
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To be honest i never tried to charge this battery at night. Should i still try? My main battery has 2.7V or something like that, maybe it got discharged when i was talking and i had 1% battery.
Hi there,
So I replaced my original battery to a bigger capacity battery (6,000 mAh), and I've been looking for a method to change battery capacity information file for Mi A1 but to no avail. Hence, the capacity is still at 3,080 (even in Kernel Adiutor) and I believe the phone wont charge to 100% 6,000 capacity. There are methods for other phones, but it seems the file is different for Mi A1 (using Havoc OS btw).
Anyone know the file location or any method to change the battery capacity?
Thanks.
what type of battery did you install? I had to change it but I couldn't find one that was so big and I had to replace one that was the same as the original.
sorry for my bad english.
I bought and installed BN31 Rakkipanda with 6,000 mAh, hence the huge difference (almost twice the capacity).
Is that even possible? I mean can u think that they will put twice the size of capacity in same size? I don't think it's 6000mah. U may damage ur device after altering capacity value. Its there for safety
Yea, I don't think that it is really 6,000 in real capacity, it is a third party battery after-all. But my original one was toast anyway, and I had nothing to lose, LOL. After installation, the battery-life in real usage is almost exactly the same as the original one (with the same ROM and kernel), but I have hunch that the battery is still not using its real capacity. I know it is probably not safe, but the phone itself is a backup phone, and I really am curious about the battery capacity.
There were double capacity batteries in Nokia old-times (and they proved to be true capacity -most of them anyway-), therefore I have faith that android phone batteries could be the same.
Hello. You can charge the phone to 100% and then check for the battery voltage. If it is close to 4.2v it means that battery is fully charged.
morcus said:
Hello. You can charge the phone to 100% and then check for the battery voltage. If it is close to 4.2v it means that battery is fully charged.
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Tried this, the voltage indicates 4331mV at 100%. Should I keep on charging or disconnect the charger?
By close to 4.2V should it be under (at 50% I peeked the voltage reached only 3.9) or a little bit over?