Database Users

Best way to charge your phone?

Should I charge my phone when it has like 0.5% battery left always, or can I charge whenever it gets a little low, like 30-40%?
Also, can I leave my phone plugged into the charger overnight? Will that drain the battery?

I leave mine in the charger every night. And I'll put it in charge at work, too, or whenever a charging opportunity arises. With this kind of battery, it really doesn't matter.

Here is a very good article that discusses Lithium Ion batteries:
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries

I don't get the article.
Does 4.2V mean 100% battery life?
If you want to charge it to 4.0 V, does that mean its like 90% battery life?

convolution said:
I don't get the article.
Does 4.2V mean 100% battery life?
If you want to charge it to 4.0 V, does that mean its like 90% battery life?
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Not certain, but it seems the charger and/or battery on the Vision is designed so that it does not keep the voltage at 100% when its charging and full. I've noticed the battery meter periodically drop to 99% when still on the charger, then back up to "F" (full). While I know the battery meter is not really accurate enough to read to 1% increments; what this seems to indicate is that once a full charge is achieved, the system is going to let the charge drop below a certain threshold, then top off again, rather than keep the voltage at 100% constantly.
The table below is a little more easily digestible (not overly technical). It says you can keep the battery on the charger.
It also says not to let the battery discharge below 20%. Overdischarge of Li ion batteries can result in your battery no longer accepting a charge, on the off chance the safety circuit does not trip properly. The safety circuit is designed to prevent over discharge of the battery, but this has been known to fail, at least on other phones. And there is no benefit to letting the battery discharge below 20%.
http://batteryuniversity.com/learn/article/do_and_dont_battery_table

convolution said:
I don't get the article.
Does 4.2V mean 100% battery life?
If you want to charge it to 4.0 V, does that mean its like 90% battery life?
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There are two terms you need to understand when it comes to batteries: volts and amps.
Volts is "static" for a battery, meaning it doesn't change. You have a 1.5V battery, it will always be a 1.5V battery. Now the capacity of the battery is measured in amps. A 1Amp battery has more capacity than a 500mAh battery. At 100% fully charged, you'd have 1000mAh (or 1A). At 90%, you'd have 900mAh.
What that article tells you is that your phone is charged to (or close to) 100% using a specified voltage (probably whatever the battery is rated at...3.7V?). Now batteries and chargers of the past had what's called a "trickle" effect, in which it still chargers the battery when it is (or close to) 100%, but at a much lower voltage. If you phone was to stop charging after it hit 100%, it would start to discharge. When you unplugged it (assuming you charge it over night) in the morning, you would have less than 100%. The trickle is so that your battery will still have 100% when you unplug it.
Think about if you filled up your gas tank and left your car running over night. When you woke up, you wouldn't have a full tank anymore. But if you left the gas nozzle in the tank while it was running, it would continually "top it off". That or gas leak everywhere and your car would burst into flames...therefore canceling the point that you wouldn't a full tank...
Anyways...Li-Ion batteries charge and behave differently that batteries of yore. It's bad to let it go down to almost 0%. It's also bad to let it continually sit on the charger. I personally charge mine every other day but I used to charge my Vibrant and HD2 every night.

The batteries in these phones have protection circuits to prevent over charging as well as over discharge. It is perfectly safe to charge over night as well as discharge until empty. What the display shows as 0% does not mean the battery has actually reached 0%. It is just were the protection circuit deems safe. It is possible to over discharge a Li-ion/LiPo battery which may cause it to no longer charge but there are ways to bring it back for the willing. Our phones, however, will not do this due to the protection circuit unless that fails. If that happens you need a new battery because Li-ion/Lipo batteries are very dangerous if over or under charged.
Also, the voltage is static in theory but in real life the the voltage does drop as the battery is discharged. The drop is not large however. A 3.7v Li-ion/LiPo cell will read around 4.2v at full charge and lowers to just over 3.7v at full SAFE discharge. If the battery falls below 3.7v, you will likely have damaged the cell. Again, our phone batteries have a protection circuit to prevent this.

ihateusernames said:
The batteries in these phones have protection circuits to prevent over charging as well as over discharge. It is perfectly safe to charge over night as well as discharge until empty. What the display shows as 0% does not mean the battery has actually reached 0%. It is just were the protection circuit deems safe. It is possible to over discharge a Li-ion/LiPo battery which may cause it to no longer charge but there are ways to bring it back for the willing.
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It would require a special charger with a "boost" function, which most people do not have access to.
From the previously linked battery University page:
In spite of these preventive measures, over-discharge does occur. Advanced battery analyzers (Cadex C7000 series) feature a 'boost' function that provides a gentle charge current to activate the safety circuit and re-energize the cells if discharged too deeply.
Most of us let our battery drain low on accident from time to time. But it makes not sense to do it intentionally or make a habit of it, as it yields no benefit (some people think they are "conditioning" or "calibrating" the battery, which does not apply to Li ion batteries), and actually hurts battery life. Also from Battery University: "Do charge the battery often. The battery lasts longer with partial rather than full discharges."
There have been pretty occasional cases on the Touch Pro 2 forums of people over-discharging the battery, and rendering it useless. So it does happen. Some have claimed that the Android OS, or the Vision phone itself handles the battery better to avoid over discharge. Maybe so. But do you really want to test that theory, if it can most usually be avoided?

redpoint73 said:
It would require a special charger with a "boost" function, which most people do not have access to.
From the previously linked battery University page:
In spite of these preventive measures, over-discharge does occur. Advanced battery analyzers (Cadex C7000 series) feature a 'boost' function that provides a gentle charge current to activate the safety circuit and re-energize the cells if discharged too deeply.
Most of us let our battery drain low on accident from time to time. But it makes not sense to do it intentionally or make a habit of it, as it yields no benefit (some people think they are "conditioning" or "calibrating" the battery, which does not apply to Li ion batteries), and actually hurts battery life. Also from Battery University: "Do charge the battery often. The battery lasts longer with partial rather than full discharges."
There have been pretty occasional cases on the Touch Pro 2 forums of people over-discharging the battery, and rendering it useless. So it does happen. Some have claimed that the Android OS, or the Vision phone itself handles the battery better to avoid over discharge. Maybe so. But do you really want to test that theory, if it can most usually be avoided?
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I agree that it can happen which is why I stated that the prevention circuit can fail though I do believe it to be a rare case that this happens. I charge when ever I am near a charger as I don't like to run low but I also don't freak out if I am close to dead. I also charge over night every night and have for years. I just don't believe that it is necessary to worry that my phone has been on the charger too long or that I am running close to 0% as there is redundant protection in place and for the most part, this protection works very well. Hell, your phone COULD burst into flames while holding it next to your ear due to the volatility of the Lithium Ion chemistry if exposed to air but that also very rarely happens.
I believe it is probably worse on the battery to watch movies on the phone while overclocked with the battery getting too hot than to discharge to 0% occasionally.
I do agree that it is pointless to try conditioning lithium batteries as they have no memory effect.
Reviving an over discharged Lithium battery should not be attempted by most. I fly RC Helis and my electrics use 3 or 6 cell LiPo's. On the very rare occasion I kill a cell, I isolate the bad cell and trickle charge until it matches the others and then resume balance charging. The batteries in our phones can be revived in the same manner. It requires low current and constant observation and should not be done by the inexperienced.

Cradle use and battery health

At the office I leave my phone in a cradle. When I get calls I remove the phone to answer and then return it to the cradle when done. My battery goes from 100% down to somewhere in the 90's then charges back to 100% in the cradle. Does this repeated process harm the battery in any way? I've read that these batteries don't suffer from the memory effect, but I'm still not sure if this counts as a charging cycle.
Sent from my Desire HD using XDA App

You should always let the battery run down completely some times maybe once a week.

Really? I've read on this forum that there is no need to do that with the new Lithium Ion batteries. I've even read that this could have a negative effect and you should try not to let the battery drain completly.
I don't understand why there isn't a proper battery care section in the manual. Its as if its some kind of voodoo science.

Perhaps not Once a week. But Once a "while"
The reason is that, Phone software uses approximation to calculate the charge left in the Battery. So over time, battery ages and software may not be calibrated to match with the battery's storage capacity. So draining the battery entirely and charging them fully gives the phone's software to assess the battery's health and recalibrate.

It's a lithium battery mate. The only way you can really damage it is by a complete discharge. So long as you don't switch the phone back on once it switches itself off due to low battery you needn't worry about anything else.

Also in theory the lithium batteries have a lifespan of say about a 1000 charges for example and everytime you charge it has one charging less left. This ofcourse isn't exactly how it is in practice but charging the battery alot wears it down. It isn't good either to keep it in the charger for a longer time after it's reached a 100%.

Hi,
this is only partly correct:
Suppose the battery can make 1000 (which I don't believe) charge cycles,
it means that you can charge 1000 times from empty to full.
If you just charge 1000 times from 50% empty to full it counts for 500 cycles!
So,
don't worry, let it stay in the cradle if you like
There are 500 opinions about that but believe, as I wrote is correct.
Theo

Yes, what I said wasn't exact science and I used 1000 cycles as an example, but from what I've read it is better to let the battery drain to less than 50% and then charge it full rather than charge 5% at a time. My previous post was meant to illustrate this.
Sent from my Leedroid powered pocketsized supercomputer using XDA App

geenome said:
You should always let the battery run down completely some times maybe once a week.
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That's a load of crap, no offense... Lithium batteries have no memory effect and have absolutely no need to be completely discharged, that's a ancient thing from the time of nickel-metal hybrid batteries. The only actual reason for full charge cycles is to calibrate the device for that exact battery.
Keeping a lithium-ion battery in a charger most of the time will wear the battery down faster than getting it drain more and then charging it. Keeping the battery almost fully loaded/in a constant loading state wears the battery capacity by approximately 20% a year (can't recall the source/study just now)(EDIT: and my personal experience is that the battery capacity will wear that much anyway, no matter how you use it). The life-cycle of phones these days are roughly two years nowadays so IMO you can keep it in a cradle with no worries, if you wish. And lets face it, a new battery after a year of usage won't be that big an investment after all.

To add to the above post, running down a lithium battery completely does more damage than benefit. This is almost impossible though with normal use as the phone shuts down long before the battery is completely empty

Ways to Protect Life Span of Samsung Galaxy S i9000 Battery

Many people just think about how to protect the Samsung Galaxy S i9000 battery life of phone, today i introduce some experience to protect our phone battery, so that we can save the battery life from these ways::highfive:
1. Fully Charged
To maintenance of a lithium battery, must occasionally let one of the electrons to maintain liquidity, to ensure that at least once a month to go through a full charge (battery is charged up about 20% full).
2. Do not use non-original straight and "universal charge"
Because the third-party charger specifications and quality can not be guaranteed with the original charger, battery might be damage repair may also cause disputes.
Why rushed 100%, they still continue to charge?
Power to 100% does not mean that your battery is already full. To Charge Gauge maximization, and roughly 40 - 80 min rushed fully full of From 100%. If the battery is aging, which will require more time in waking this process.
3.Do not drain the battery.
Try not to use automatic shutdown on the line, often run out of battery power will affect the battery capacity and charge cycles.
4. Do not overcharge
Stop charging long after the battery has been fully charged phone prompts, 40 to 80 minutes.
5.Note heat
Please keep in charge when the phone is easy to heat the place. Because the battery charging will occur.
Today, i just write thess ways to help you guys protect the cell phone battery, just do hope it is a help to you!

junior2012 said:
4. Do not overcharge
Stop charging long after the battery has been fully charged phone prompts, 40 to 80 minutes.
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If you charge the phone while it's turned off it shouldn't overcharge anyway.
It charges to 99% then stops automatically. So you can leave it charging overnight without damaging the battery.

I used this: http://www.androidzoom.com/android_...vity/battery-saver-dx-power-widget_blaeb.html
I'm sure there are some others doing the same...

Recharge Early prolongs Battery Life
It's absolutely impossible to Overcharge a Lithium Ion Cell with the Stock Charger, despite of On/OFF State of the Phone so don't worry. A Lithium Ion Cell would degrade a lot (permanently) if you'd overcharge it but this is really not a Problem those days, because the Recharge Process will surveilled by a seperate Microprocessor to avoid any overcharging. In my Experience it is much better only to recharge the Battery ONLY when the Phone Power is Off- that's what every Manufacturer writes in the User Manual. Me personally using a Universal Charger with a second battery, so i can always use the Phone and the USB Connection will not be stressed. Also i am recharging early- that means a Battery Level from 30-70 %. If you recharge when the Batttery Level is about 3.7 Volt recharging goes much faster and the Battery will not be stressed that much like when you run it till it's completely empty- that should implicitly be avoided!). It's NOT necessary to decharge completely- o.k. If you don't do that from time to time it affects the shown Battery Level a little bit but if you recharge early and often this is not a Issue at all.

I run battery cycle from 25% to 80%. I keep it between these levels. It is good for Lithium Ion Cell batteries as neither cell is empty. If it gets empty, impurities settle on the anode/cathode.
There was an app which allowed limiting max charge. Was it NSTools or something on those lines. What was it called? *scratching my head*

New s7 battery conditioning

Hey guys, I recieve my s7 edge today, whats the best way to condition the new phones battery? Some use what it has until its low to recharge until 100 others leave phone off and charge to 100 at start, whats the best result for a good healthy battery?,
Thanks

Lithium ion batteries have come a long way. There is no "memory effect" and conditioning is probably not really all that necessary. If I were you I'd just give it a charge to 100 and use as normal. Might have high drain for the first few days/charge cycles.
Remember that with Li-Ion batteries a "charge cycle" is one complete cycle from 0% to 100%. So by charging when it's at 50% you're only using up one half of a "rated charge cycle" - Battery conditioning shouldn't really be required with modern lithium ion batteries.

Battery conditioning isn't necessary but charging fully and depleting fully will help the phones software learn the battery capacity and give the most accurate percentage remaining reading. I'd say do this a couple times after you first get the phone

gaff15 said:
Battery conditioning isn't necessary but charging fully and depleting fully will help the phones software learn the battery capacity and give the most accurate percentage remaining reading. I'd say do this a couple times after you first get the phone
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This makes sense I guess. But wouldn't the battery percentage remaining be based on the voltage in the battery at a given moment? I wouldn't think the phone would need to "learn" that.

Afaik. It's actually bad to discharge li-ion and li-po batteries down low. I think it's better for battery health to recharge around 50% for instance than waiting until 0%.

Xileforce said:
Afaik. It's actually bad to discharge li-ion and li-po batteries down low. I think it's better for battery health to recharge around 50% for instance than waiting until 0%.
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The 50% mark is an old(and still good) rule of thumb primarily for lead acid batteries.
Leaving these batteries in a discharged state can be bad for them, but in normal usage even a discharge to 0% is fine if followed shortly by a charge cycle. These devices have a low voltage cutoff which is what shuts the phone down and protects the battery from over discharge and damage. Bottom line is use and charge it however you like, the only thing that may change is the time it takes the software to learn your discharge profile and show accurate stats.

Ashevar said:
The 50% mark is an old(and still good) rule of thumb primarily for lead acid batteries.
Leaving these batteries in a discharged state can be bad for them, but in normal usage even a discharge to 0% is fine if followed shortly by a charge cycle. These devices have a low voltage cutoff which is what shuts the phone down and protects the battery from over discharge and damage. Bottom line is use and charge it however you like, the only thing that may change is the time it takes the software to learn your discharge profile and show accurate stats.
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This makes sense. The article I read awhile back was likely referring to non smart charging systems, such as a battery pack. It makes sense that an integrated solution such as a phone would regulate that to maintain battery health.

There are three things that are very bad for Li batteries. 1: overcharging. 2: completely draining. 3: overheating. Li batteries are happiest, and will last the longest, if never cycled above 75% or below 25%. Cars like the Tesla actually show 100% charge when the battery pack is only about 75% charged, and show the battery as depleted well above 0% charge. Then again, the battery pack for a Tesla costs a lot more than a phone.
#1 shouldn't be a problem in any modern device. The circuitry in the battery will tell the phone when to shut down charging to prevent overcharge. #3 can be a problem. If you're charging the battery simultaneously with high battery draining phone usage (e.g., GPS and Nav) phones can get very hot. In fact, I've had my phone stop charging and display a warning when I was navigating and charging the phone wirelessly at the same time. If you're using GPS on a long trip, you almost have to charge it while in use, but might want to avoid wireless or fast chargers. Wireless chargers and fast chargers generate more heat.
#2 is up to you. Repeatedly discharging the battery to single digits will reduce it's lifespan. I try to recharge before 25% but if I get into a situation where I can't I don't obsess over it. I don't worry too much about charging to 100%. I suspect that, like Tesla, 100% is probably not really 100%. The battery manufacturers are likely to leave a little safety margin in there to ensure batteries can't overheat and catch fire.

meyerweb said:
There are three things that are very bad for Li batteries. 1: overcharging. 2: completely draining. 3: overheating. Li batteries are happiest, and will last the longest, if never cycled above 75% or below 25%. Cars like the Tesla actually show 100% charge when the battery pack is only about 75% charged, and show the battery as depleted well above 0% charge. Then again, the battery pack for a Tesla costs a lot more than a phone.
#1 shouldn't be a problem in any modern device. The circuitry in the battery will tell the phone when to shut down charging to prevent overcharge. #3 can be a problem. If you're charging the battery simultaneously with high battery draining phone usage (e.g., GPS and Nav) phones can get very hot. In fact, I've had my phone stop charging and display a warning when I was navigating and charging the phone wirelessly at the same time. If you're using GPS on a long trip, you almost have to charge it while in use, but might want to avoid wireless or fast chargers. Wireless chargers and fast chargers generate more heat.
#2 is up to you. Repeatedly discharging the battery to single digits will reduce it's lifespan. I try to recharge before 25% but if I get into a situation where I can't I don't obsess over it. I don't worry too much about charging to 100%. I suspect that, like Tesla, 100% is probably not really 100%. The battery manufacturers are likely to leave a little safety margin in there to ensure batteries can't overheat and catch fire.
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#1 -> Could be a problem. Manufacturers can set the 100% mark at higher voltage to make it look like it has more capacity while sacrificing longevity, just enough to get through the 1 year warranty period. (Lot of powerbanks do this!) Users have no control of this ceiling. Charging to 80% and letting it cycle below that probably keeps the battery much healthier than keeping it plugged overnight at 100%.
There's an app called AccuBattery on playstore that people might want to check out. It's basically an alarm that turns on when the battery is at desired % level. It also cites real research papers so I would trust what they are doing.

I used to have a long post with a detailed technical explanation but lost it.
Anyway the gist is, basically, batteries work by ion movement, and like a machine, these ions wear out over time due to use. And similar to machines, heavy use wears them out more. You're more likely to break an engine by running it for 1 day at max rev, than running it over a month at half capacity. The smaller the depth of discharge, the lower the wear. Lab tests have concluded that when you constantly discharge from 100 to 0, it allows you betwrrn 300-500 charge cycles before it starts to break down and not hold charges. More specifically, when you reach that magic number your battery can only hold 75% of it's original charge. That's typically 1-2 years of use if you charge once a day. And heavy abusers charge more than once a day, so that decreases the time span to however many weeks it takes them to reach 500 charge cycles. Now, the increase in charge cycles is exponential, not arithmetical. So a depth of discharge to 50 before recharging will not give you 600-1000 charges. Rather it will give you 1200-1500 charge cycles. Mathematically, draining a 3600mah to zero for 300 charges gives you 1080000mah to burn through however short your battery life will be. On the other hand, using only 50% of the battery before recharging gives you 2160000mah to burn through before it expires after at least 1200 charge cycles. In other words, it stored twice more power for you to use. If you say, charge once every 24hrs, going always from 100 to 0 gives you at least 300 days. Recharging twice a day at 50% gives your battery at least 600 days of use before battery capacity deteriorates noticeably. Discharging to 75% before recharging actually gives you 2000-2500 charge cycles, making it even longer. Basically the point is, always plug the phone in when given the chance. Don't wait for 50%, or whatever. 40% is an arbitrary number actually, not sure why it's chosen. Also, this is why one of the choices to auto activate power saving in the S7 is at 50%, so that it keeps the battery up as close to 50% as possible when you get the chance to plug in.
As for charging to 80%, this is because partial charge is better than full charge for lithium ion batteries. The ions are placed on stress to hold charges. Maximum stress is at 100% charge. And like everything else, stuff tends to break more. So not running it to 100% all the time will reduce overall stress experienced and increase the time before deterioration occurs. Personally I charge to 90%, and discharge to 40% or above. That's a 50% depth of charge, so that's good for up to 1500 charge cycles, plus whatever number of cycles the decrease in max stress gives me.
However, note that environmental temperatures also play a role in battery longevity.
Sent from my Galaxy S7 Edge Duos via Tapatalk

just use the dang phone...

cri[LIST=1 said:
[/LIST]s_epic;65635276]Hey guys, I recieve my s7 edge today, whats the best way to condition the new phones battery? Some use what it has until its low to recharge until 100 others leave phone off and charge to 100 at start, whats the best result for a good healthy battery?,
Thanks
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Click to collapse
That's actually a perfect way to ruin your battery on purpose!
Just do these things and Don't worry a lot. And remember, when it does die it's not your fault, it's kind of a problem with Lion batteries!
1. Try to keep the battery between 40-80% or 20-40%. But don't worry if tou can't. Saying this in case you're staying at home all day.
2.Keep the heat away from it!!! This one is important
3. Try to discharge it at a lower rate but don't let that get in the way of you enjoying your device.
4. Try not to discharge below 8% at all. But try to not discharge it below 15-20% unless you have important things to do.
5. don't keep it topped of for a long time (like constant going 90-100%, this is damaging) and don't keep it at 100% for long! (For example turning it off and stop using it for a week, or keeping it plugged for a few days)
If you're storing it keep it at 40% (3.8-3.75V) and try to drain it once in a while. (Unlikely to happen with a phone specially one without a removable battery )
I really do hope someone invents a new type of battery. Lipos are anoyying

Simple you don't need too lol
Sent from my SM-G935F using XDA-Developers mobile app

Battery Calibration

I'm using Resurrection Remix (i9505) and i want calibrate my battery (with root). Can anyone say any app and the steps to calibrate ?! Sorry my bad english :cyclops:

Battery calibration is just a myth.
I did it on my old phone and there was absolutely no difference between calibration and no calibration.

GDReaper said:
Battery calibration is just a myth.
I did it on my old phone and there was absolutely no difference between calibration and no calibration.
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I'm asking because i bought a Samsung Portable Charger (2.100mah). The Galaxy S4 have a battery with 2.600mah. 2.100 is 80% of 2.600. But the Portable Charger is charging 95%, so i think it's a software problem.

The battery is polled for its vital statistics by the device. The device translates what it receives from the battery's internal circuits to a percentage, which is reflected in the status bar. All battery calibration apps are useless for two reasons. The first reason is they don't recondition the battery. To do so requires expensive hardware, since this is a lithium ion battery we're talking about. The second reason is that they delete the batterystats.bin file within Android. Deleting that file isn't going to do any harm, but that file is deleted upon the battery being fully charged and disconnected from the charger.
Battery calibration is useless. Any positive results are from the placebo effect.

AlfaTeam Corporation said:
I'm asking because i bought a Samsung Portable Charger (2.100mah). The Galaxy S4 have a battery with 2.600mah. 2.100 is 80% of 2.600. But the Portable Charger is charging 95%, so i think it's a software problem.
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Then let the battery get to 0 and charge to 100. That's the most reasonable method. Any other app just deletes the batterystats, which also gets deleted whenever you unplug the charger from your phone.

AlfaTeam Corporation said:
I'm using Resurrection Remix (i9505) and i want calibrate my battery (with root). Can anyone say any app and the steps to calibrate ?! Sorry my bad english :cyclops:
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Click to collapse
Make battery from 100% to 0%. Don't turn on phone until it gets 100% battery. Then use an app called "Battery Calibration" by Miroslav vitulea.

@gosha98_: Draining the battery to zero will not reset the battery. In fact, draining a lithium ion battery to zero is dangerous, as at zero percent charge the battery becomes unstable and may explode. Back in the era of NiCd and NiMH batteries, draining to zero could in fact "reset" the battery, but not today with lithium ion.
Using a battery calibration app prior to removing the battery off charge will not hurt the phone or the battery since all battery calibration apps do is delete the batterystats.bin file in Android. But, it will not help either.

Strephon Alkhalikoi said:
@gosha98_: Draining the battery to zero will not reset the battery. In fact, draining a lithium ion battery to zero is dangerous, as at zero percent charge the battery becomes unstable and may explode. Back in the era of NiCd and NiMH batteries, draining to zero could in fact "reset" the battery, but not today with lithium ion.
Using a battery calibration app prior to removing the battery off charge will not hurt the phone or the battery since all battery calibration apps do is delete the batterystats.bin file in Android. But, it will not help either.
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Thanks for your precisation

GDReaper said:
Then let the p0battery get to 0 and charge to 100. That's the most reasonable method. Any other app just deletes the batterystats, which also gets deleted whenever you unplug the charger from your phone.
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I bought a Samsung Portable Charger (2.100mah). The Galaxy S4 have a battery with 2.600mah. Doing the calculations you will see that 2.100 is 80% of 2.600, so will charge my phones battery 0% to 80%. But it's charging 0% to 95%. Why ? I don't undestand... Sorry my bad english