Database Users

Kaiser's Stock Battery, Ground Plane?

I wanted to add a comment about the Kaiser's battery. It's the first lithium phone battery that I've seen with a ground plane, the inside face of the pack is a metal plate. The plastic film "case" around the battery has this metal plate exposed at all 4 corners to make contact with mating gold fingers in the battery box, all around the battery. I bring this up because there are always cheap batteries available for these phones and I would beware of one without this extra shielding, it may affect performance or just radiate more stray R/F?
Also it's the same capacity as Hermes but has 4 contacts vs Hermes 6 and they are in different locations. You'd think they could work on a "standardized" battery for phones. I found that the Kaiser's USB charge jack is in the same location as the Hermes and that I am able to place it onto the charge cradle that I currently have. Unfortunately the 2nd battery charge bay is useless, but this will work until the next generation of accys and cases come out.

I didn't know batteries generated RF. WiFi sure, and bluetooth yes, but a battery?

No, batteries don't normally radiate, burn maybe, but not radiate. I'm thinking that since it's the inner face of the battery, that it's forming a shield for the back of the phone's electronics.

It might be an antenna for something as well !

Yes, sounds like it could be a ground plane for an antenna. GPS perhaps? Getting my HTC unlocked tytnII tomorrow, will look into it.

1600 mAh replacement battery
RemE said:
I wanted to add a comment about the Kaiser's battery. It's the first lithium phone battery that I've seen with a ground plane, the inside face of the pack is a metal plate. The plastic film "case" around the battery has this metal plate exposed at all 4 corners to make contact with mating gold fingers in the battery box, all around the battery. I bring this up because there are always cheap batteries available for these phones and I would beware of one without this extra shielding, it may affect performance or just radiate more stray R/F? . . .
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I just received a battery I ordered from http://http://stores.ebay.com/Acces...harger_W0QQcolZ4QQdirZ1QQfsubZ9QQftidZ2QQtZkm.
It does not have the exposed metal corners of the original battery. It powers up the phone fine, but now I'm worried that I may cause a problem.
Would like to know the purpose of the metal contacts, and how important it is to stay with the exact match battery.

My educated guess is that it's a radio interference shield, probably required for certification. I'm sure of one thing, they didn't do this for fun, it was required.
Like most PC hardware, they are specified as Class B/ Class C etc. relating to radiated interference for home use vs commercial use (higher levels allowed). Once purchased, we merrily change bits and pieces, possibly voiding the original certification, but with little if any noticible consequence.
I think this is similar, unless someone notes that there is poor performance in one of the radios, like reduced sensivity from the GPS etc. we won't know.

RemE said:
My educated guess is that it's a radio interference shield, probably required for certification. I'm sure of one thing, they didn't do this for fun, it was required.
Like most PC hardware, they are specified as Class B/ Class C etc. relating to radiated interference for home use vs commercial use (higher levels allowed). Once purchased, we merrily change bits and pieces, possibly voiding the original certification, but with little if any noticible consequence.
I think this is similar, unless someone notes that there is poor performance in one of the radios, like reduced sensivity from the GPS etc. we won't know.
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if it is required then should we not see it on other pda batteries? is there a plate on the back of the battery for the 8525?

Not necessarily, this is the first shield plate that I've seen on any phone, the fact that it's there with matching contacts in the 4 corners of the Kaiser's battery box means that on THIS phone, this was designed in. We just don't know the engineering reason,but there is one.

I think this is used as either some kind of antenna or for some kind of isolating purpose. No doubt about that. I just purchased the following battery:
http://www.batteryupgrade.com/produ...rchphrase=HTC%20P4550%20battery%20(1600%20mAh)
This battery does not have the plate in the back like the original battery. By the way I recommend this battery, so far it works great. Same size as OEM and no need for new cover. Made in Honk Kong and ships from there, comes with 1 year warranty.
One interesting thing that I do notice using this new battery is that it appears that my GPS reception has improved. With the original battery I do not get reception indoors and now I do (although not always). I believe I can confirm this as well. I was never able to get any GPS reception anywhere indoors before (meaning inside of a home).
RemE said:
I wanted to add a comment about the Kaiser's battery. It's the first lithium phone battery that I've seen with a ground plane, the inside face of the pack is a metal plate. The plastic film "case" around the battery has this metal plate exposed at all 4 corners to make contact with mating gold fingers in the battery box, all around the battery. I bring this up because there are always cheap batteries available for these phones and I would beware of one without this extra shielding, it may affect performance or just radiate more stray R/F?
Also it's the same capacity as Hermes but has 4 contacts vs Hermes 6 and they are in different locations. You'd think they could work on a "standardized" battery for phones. I found that the Kaiser's USB charge jack is in the same location as the Hermes and that I am able to place it onto the charge cradle that I currently have. Unfortunately the 2nd battery charge bay is useless, but this will work until the next generation of accys and cases come out.
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How is ther performance of this battery? Any better or a lot worse then the original battery? I'm really finding it hard to find charging point everywhere i go cos the original battery just cannot last the whole day
c6638746 said:
I think this is used as either some kind of antenna or for some kind of isolating purpose. No doubt about that. I just purchased the following battery:
http://www.batteryupgrade.com/produ...rchphrase=HTC%20P4550%20battery%20(1600%20mAh)
This battery does not have the plate in the back like the original battery. By the way I recommend this battery, so far it works great. Same size as OEM and no need for new cover. Made in Honk Kong and ships from there, comes with 1 year warranty.
One interesting thing that I do notice using this new battery is that it appears that my GPS reception has improved. With the original battery I do not get reception indoors and now I do (although not always). I believe I can confirm this as well. I was never able to get any GPS reception anywhere indoors before (meaning inside of a home).
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c6638746 said:
I think this is used as either some kind of antenna or for some kind of isolating purpose. No doubt about that. I just purchased the following battery:
http://www.batteryupgrade.com/produ...rchphrase=HTC%20P4550%20battery%20(1600%20mAh)
This battery does not have the plate in the back like the original battery. By the way I recommend this battery, so far it works great. Same size as OEM and no need for new cover. Made in Honk Kong and ships from there, comes with 1 year warranty.
One interesting thing that I do notice using this new battery is that it appears that my GPS reception has improved. With the original battery I do not get reception indoors and now I do (although not always). I believe I can confirm this as well. I was never able to get any GPS reception anywhere indoors before (meaning inside of a home).
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YA i like to know how much more does this last than the org battery
1 more hr or more ?
thankyou

very strange battery problem no awnsers any where

Hi all
I have brought a sunny cube v7 (cheap tablet) and upon receiving this morning I went ahead and left it to charge for a few hours. When I came back it was fully charged so unplugged it imediatly powered off. I cracked it open and the battery it self is reading about 4v but after the protection circuit its reading about 2, the tablet itself is saying its fully charged but it won't turn on without charger . tried looking everywhere but all I could read was about not charging or a defunct battery. Any help is appreciated

Just give it back if it's under warranty?
Sent from my ST26i using xda premium

Thats the problem it wa from china so by the time i pay for shipping back there i might as well buy another one, it was only £40

Well, you seem to know about the protection circuit.
They can vary in coverage from over-discharge, over-charge and over-current.
Some of them will actually latch up once activated.
If you battery is reading 4 V there is no reason for the protection to be activated.
You can try bypassing the protection circuit.
That's living a bit dangerously, both as to your health and the health of the battery.
Still, as a proof of principle you could do it carefully.
You can buy a similar battery protection module on eBay for a couple of bucks.

Renate NST said:
Well, you seem to know about the protection circuit.
They can vary in coverage from over-discharge, over-charge and over-current.
Some of them will actually latch up once activated.
If you battery is reading 4 V there is no reason for the protection to be activated.
You can try bypassing the protection circuit.
That's living a bit dangerously, both as to your health and the health of the battery.
Still, as a proof of principle you could do it carefully.
You can buy a similar battery protection module on eBay for a couple of bucks.
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Thanks for the info, I work as an electrical engineer repairing phones for insurance companies so i sort of know what im on about but never had this problem before and nobody at my work has faced it so thats a dead end. all I know about it is what ive read, I havent come across any information about this problem online. Do you know if i can just buy a similar protection circuit, or can I buy a bigger size battery (both in size and capacity) and will it still charge fully? thanks for the help!
Edit:
will my tablet tell me how charged the battery is if I remove the protection circuit?
2nd Edit, what controls the voltage to the battery, the circuit on the mother board or the protection circuit, as i understand it the protectionis only there in case the mobo gets a short, in other words the mobo says "im not taking any more voltage from you battery" then proceeds to shut down, is this the case? also with charging is it the mobo that starts the trickle charge +90% batt or isit the protection circuit, any help is greatly appreciated just want to get this sorted

The protection circuit is completely invisible and inactive except in cases of failure.
Charging circuits on the main board control conditioning, charging, terminating.
Determining percentage battery charge is a bit of voodoo based on voltage, temperature and estimated current load.
I don't know if any device (some? all?) are using Hall effect current sensors to measure instead of estimating.
I would think that a slightly bigger battery would not be a problem.
A smaller battery would not like getting charged too fast.

Replacing both the battery and the protective circuit shouldn't really be a problem. Are you measuring the voltage on the battery before/after the protective circuit - under load though? A battery without a load will always show a higher voltage than when "put to work". The protecive circuit itself does put a microscopic load on the battery, but I'm not sure if its enough for a decent load voltage read. if you have an old computer fan (probably won't go around if sub-5 volts, but should tolerate load long enough for a read) or something else that will "just work" off a 3.7v supply, I'd suggest you try that before shopping for parts.
Keep in mind, if buying a new protective circuit - it should be rated to comply with your tablet. Overcharge and overdischarge voltages are fairly similar across the board - but you'll want to look at Overcharge and overdischarge currents. Make sure these do not crash with the normal operational currents of the tablet. If the tablet for example, consume up to 2 amps under heavy load - you cannot use a protective circuit with an overdischarge current rating of less than 2 amps. If you did, it would trigger the protective circuit under normal (heavy) use. Same for overcharge current - make sure it is rated with a reasonable margin above what the stock charger delivers - otherwise the stock charger will pop the circuit.
I'd also advice getting one that is designed for the number of cells the current (or new) battery "pack" will be composed of. It will make putting it together much more simple and tidy.

Battery replacement, is it worth it and can you fit a larger one inside?

Hi everyone,
I have had my Nexus 4 for over a year and have noticed that the battery just doesn't last as long as it used to. So I ask, those who have replaced it, is it worth it and do you see a difference? Also, can you fit a larger battery inside with the glass back still intact? Like maybe a 2500 size instead of the stock 2100?

It's not worth it until you rule out other causes of the battery draining. Software is the problem 99 times out of 100. You should only ever replace the battery with an original one.

22sl22 said:
Hi everyone,
I have had my Nexus 4 for over a year and have noticed that the battery just doesn't last as long as it used to. So I ask, those who have replaced it, is it worth it and do you see a difference? Also, can you fit a larger battery inside with the glass back still intact? Like maybe a 2500 size instead of the stock 2100?
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After about 500 cycles, a lithium rechargeable battery will have lost upwards of 20% of its original capacity. If you charge more than once a day, you could have reached that point by now. A new battery is about $20 off eBay. I can't comment on the difference it actually makes because I got my Nexus 4 with a broken screen and replaced the screen and battery at the same time.
You can also extend your battery life by flashing a custom kernel like HellsCore (which is slightly undervolted) and play around with underclocking, undervolting, different governors, and running on fewer cores. For example, I've kept mine at a dual core 1.2GHz with intellidemand governor (CM11), and it still runs smoothly most of the time, with only the occasional hint of stutter. And if you want to play a game or something, just crank everything back up. And of course there's the obvious battery-saving methods, like turning screen brightness down, disabling GPS/wi-fi, synching less often, and limiting data to 3G instead of 4G. Plus the less obvious methods like Greenify and/or Tasker.
To my knowledge, there's no higher capacity batteries, or even external battery cases for the Nexus 4.

Planterz said:
After about 500 cycles, a lithium rechargeable battery will have lost upwards of 20% of its original capacity. If you charge more than once a day, you could have reached that point by now. A new battery is about $20 off eBay. I can't comment on the difference it actually makes because I got my Nexus 4 with a broken screen and replaced the screen and battery at the same time.
You can also extend your battery life by flashing a custom kernel like HellsCore (which is slightly undervolted) and play around with underclocking, undervolting, different governors, and running on fewer cores. For example, I've kept mine at a dual core 1.2GHz with intellidemand governor (CM11), and it still runs smoothly most of the time, with only the occasional hint of stutter. And if you want to play a game or something, just crank everything back up. And of course there's the obvious battery-saving methods, like turning screen brightness down, disabling GPS/wi-fi, synching less often, and limiting data to 3G instead of 4G. Plus the less obvious methods like Greenify and/or Tasker.
To my knowledge, there's no higher capacity batteries, or even external battery cases for the Nexus 4.
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DrFredPhD said:
It's not worth it until you rule out other causes of the battery draining. Software is the problem 99 times out of 100. You should only ever replace the battery with an original one.
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Thanks for the replies.
I've tried software tweaks, kernel tweaks, everything, greenify all things in that sorts, different kernel profiles etc. It makes a difference but still not as good as it used to be. I might as well try replacing it, I can always put the old battery back in if I want, not that hard to change. There's a Galaxy S3 battery, I think its the same size, not sure with a higher capacity, same size, same voltage etc I could go for that if I wanted to :good:
Sent from my Nexus 4

22sl22 said:
There's a Galaxy S3 battery, I think its the same size, not sure with a higher capacity, same size, same voltage etc I could go for that if I wanted to :good:
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Have you seen what the N4's battery and connector looks like? That ain't gonna work. It won't fit, for one thing. Wrong shape, and the N4 battery is pretty slim because it doesn't have a stiff protective covering (it's actually kinda flexible - be careful prying it off the adhesive) and even if you found a battery that did fit, you'd have to rig up some sort of splice for the connector, which would probably take up more space, defeating the purpose of finding a higher capacity battery.
I did find a couple battery cases. There's the Mugen 4500mAh, but it's both freaking huge and freaking expensive (nearly 1" thick, $90), and the ZeroLemon, but it's also freaking huge, only has a (removable) 2200mAh battery, and I can't find one anywhere actually for sale.

Planterz said:
Have you seen what the N4's battery and connector looks like? That ain't gonna work. It won't fit, for one thing. Wrong shape, and the N4 battery is pretty slim because it doesn't have a stiff protective covering (it's actually kinda flexible - be careful prying it off the adhesive) and even if you found a battery that did fit, you'd have to rig up some sort of splice for the connector, which would probably take up more space, defeating the purpose of finding a higher capacity battery.
I did find a couple battery cases. There's the Mugen 4500mAh, but it's both freaking huge and freaking expensive (nearly 1" thick, $90), and the ZeroLemon, but it's also freaking huge, only has a (removable) 2200mAh battery, and I can't find one anywhere actually for sale.
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Yeah I've seen all the cases already. Too big. I don't mind doing surgery on the battery to make it work but only if I can find a higher capacity one that's gonna fit I'll consider it.
Sent from my Nexus 4

22sl22 said:
Yeah I've seen all the cases already. Too big. I don't mind doing surgery on the battery to make it work but only if I can find a higher capacity one that's gonna fit I'll consider it.
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I've thought about trying getting a new back cover (minus the glass), cutting a chunk out of it, and rigging up a larger capacity battery. It's the connector that stops me (that, and my lack of knowledge and tools to do so).

Planterz said:
I've thought about trying getting a new back cover (minus the glass), cutting a chunk out of it, and rigging up a larger capacity battery. It's the connector that stops me (that, and my lack of knowledge and tools to do so).
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Just do this. This is where I got the surgery idea. Bit complex but it seems like its worth it :good:
http://forum.xda-developers.com/nexus-4/general/4200mah-nexus-4-internal-battery-t2239829
Sent from my Nexus 4

There is no way you're going to put an s3 battery into a nexus 4 and have good results, please put any notion of this out of your head now, it's pretty absurd. Also you may struggle to use your original battery after replacement, a lot of people damage it during removal.

DrFredPhD said:
There is no way you're going to put an s3 battery into a nexus 4 and have good results, please put any notion of this out of your head now, it's pretty absurd. Also you may struggle to use your original battery after replacement, a lot of people damage it during removal.
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Look at the above thread, its possible and doable, not absurd.
I'll be careful when taking it out, its easier with a hair dryer because of the adhesive under the battery
Sent from my Nexus 4

Anyone who did it is an absolute idiot, but whatever, melt your phone and burn your face off if you want. Notice how there are no follow up posts from anyone even a month down the line in that thread, I think they all died (but seriously, their battery is ****ed now and they're too embarrassed to post anything)
But here's some videos of lithium batteries exploding from incorrect charging
https://www.youtube.com/watch?v=SMy2_qNO2Y0
https://www.youtube.com/watch?v=VswaFOrVM6I
Also the fact you want to use a samsung battery has me even more concerned
https://www.google.co.uk/search?q=s...HV0QXy24CoCQ&ved=0CAYQ_AUoAQ&biw=1366&bih=643
http://www.androidpolice.com/2013/0...-burn-from-a-galaxy-s3-samsungs-off-the-hook/ (This girl used a fake s3 battery, in an actual s3. You're gonna put a fake s3 battery in a Nexus 4?!?!?!)

I agree with what DrFredPhD said, LIB are very dangerous if tampered with or altered physically.

If you're really having drastic differences in battery life then you're supposes to then I would suggest you replace your N4 battery with an original one itself, don't go for any other options

stazi34 said:
I agree with what DrFredPhD said, LIB are very dangerous if tampered with or altered physically.
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Yeah, running/charging multiple lithium batteries typically isn't a good idea. But the videos that DrFredPhD posted aren't what you'll get with a cell phone battery.
Li-ion and Li-po batteries in commercial devices have built-in circuitry to prevent overcharging, overdischarging, reverse polarity, and short circuits. If you short it, the circuitry kicks in and kills everything. Putting it back in the device/charger resets the kill switch. Same if the charge gets too high, or the discharge gets to low. Circuity switches the battery off, and prevents overcharging and runaway discharging.
Those videos show batteries that don't have that circuitry. Either it was removed, or they're cells used by hobbiests and were purchased unprotected. Unprotected cells are available for hobbiests (R/C stuff, high-powered flashlights, etc) and some use them because the circuitry in protected cells leeches a bit of your juice. In an R/C car, that could mean a few more seconds and one more completed lap, in an R/C plane or helicopter, a few more seconds of air time before you crash. But there are obvious dangers.
Those dangers don't exist with commercial protected batteries. Well, they do, but that's when you buy a cheap knock-off from China, or the cell is defective, like those Sony and Dell laptops that were catching fire several years ago.
But even with protected commercial batteries, problems can occur (just not explosively dangerous ones). If the cells are mismatched in capacity, or one has a higher charge than the other, the higher capacity one will try to charge the other one, and the battery life of both will suffer, plus since they're also trying to power the device or receive a charge, they'll get really hot and can be damaged. Running identical cells is one thing. Charging should be done separately so that they start off the same. It's not the same as with a laptop or electric car, because they have additional circuitry to make things safe. It's also not the same as using a battery bank to power/charge your device, because effectively, that's just the same as plugging into a USB jack.

Battery Monitor Widget Pro is reporting around 1700mAh or less to me now so I'm wondering if my battery also needs to be replaced... Happy to use quality OEM but can it be done myself or should I pay someone?

DroidBois said:
Battery Monitor Widget Pro is reporting around 1700mAh or less to me now so I'm wondering if my battery also needs to be replaced... Happy to use quality OEM but can it be done myself or should I pay someone?
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You can replace it yourself. You'll need a T5 TORX driver for the screws at the bottom of the phone, and then something thin to pry the halves apart, preferably plastic so you don't damage your phone's body. It helps to heat it up with a hairdryer to soften the glue.
As for that app, I don't know if I trust it.

Nexus 4 Solid Red Light, Not Working, Dead (Bad Chip?)

Bad week this is. First my old Galaxy S3's USB port fails when I give it to my dad (no data, otherwise charges), now my brother's 2 year old Nexus 4 dies.
I did all the troubleshooting and found the fixes involving the battery contacts and removal, the emergency reset procedures using the hardware keys, and the battery itself. No fix.
Battery is good, tests 3.75V, and won't charge anymore after leaving on different chargers. Disassembled whole phone and cleaned and checked all parts
Phone has been overheating for a while now as I was told, my brother is very lazy and never did anything about it, he told me his back screen even cracked from intense heat(Hard to Believe)
Now that it's dead, I noticed that the battery was cold, but the phone was well hot when on charger. After testing I found the Power Management chip to be heating up way to much and only 1.8V
going to battery at charge pins. Part is by Qualcomm, PM8921 and is used on other phones like my Galaxy S3. Seems this is the defective component causing all this. Look at left chip in picture.
Problem is desoldering and soldering is a job Santa's little helpers or a bot. This is damn near impossible to do by a human, especially by me. Found chips on ebay and alibaba which range from
$2 ea. bulk to about $8 individually. Wonder what now... anyone else think it may be something else? Throw away? Find professional to solder in?

XDA Exec battery connections for adapting different packs

Hi everybody.
I came here hoping to find sources for replacement batteries as both my XDA Execs are now unable to stay on for more than a few minutes. But from another thread I see that these batteries were last heard of back in 2019.
So, in an attempt to try and adapt currently available batteries to fit, I need to find out what the function of the two inner contacts on the XDA Exec are for.
The two outer ones are easily identifiable as +Ve and -Ve and -Ve, but I am stumped as to the inner ones. Is one for a thermistor? One for a charge sense?
Any help either regarding what these pins do or other workarounds gratefully received.

That's going to be a tricky one to source more batteries. Maybe get the dimensions of it, and look around for a similar (slightly smaller) one that can fit inside. You could solder wires between a smaller battery to the phone battery terminals perhaps.
I believe the outside pins are +ve and -ve. The inner ones are battery status indicator, and battery temp. not sure which is which o that particular device.
EDIT: This thread should help with which pin is which
Possible battery solution (fix)
Fellow universal users who suffer from battery problems, i know this issue is reccuring and is in many threads and forums now. However i am sorry to increase the talk in another thread. I just thought i would share my peice of advice. Attached...
forum.xda-developers.com

the_scotsman said:
Maybe get the dimensions of it, and look around for a similar (slightly smaller) one that can fit inside. You could solder wires between a smaller battery to the phone battery terminals perhaps.
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Thanks, I have already started looking at other batteries, the XDA Exec is one of the largest so getting one of lesser dimensions is actually quite easy, but knowing the pinouts of both the Exec and the newer battery is going to be critical.
As far as soldering wires goes, I would be more inclined to try opening up the old battery and soldering new Lion or LiPo cells inside.
Thanks for the link to the other thread, it does indeed suggest the battery sense is adjacent to the -Ve, and therefore the Thermistor lead will be adjacent to the +ve.

No worries. Yea, that would be the best option, replacing cells inside. That's not for everyone though. A bit of skill is involved, which is why I didn't suggest it. But you obviously know enough in this area, so definitely go that way for sure

Did you get anywhere with this? I'd like to power up my Exec as well, but can't without a battery.