Database Users

my jasjar is turn off when it get to 40% buttery power

my jasjar is turn off when it get to 40% buttery power , what can it be ? if i charge it it dosent turn off but without power charger it work just until 40% .
thanks in advance.

http://forum.xda-developers.com/showthread.php?p=1081974#post1081974

sometimes this is just due to topping up charges and there is not a "continuous" supply current in the battery at that 40% mark. I had it once but always top up whenever halfway or very low and never had problem, but a way to fix the glitch is to drain the battery and then fully charge it

Li-Ion batteries do not suffer from memory effect. I have read in several tech reports on Li-Ion technology that it is actually better to top up often, like a lead acid battery. If the battery goes into deep discharge conditions, this will potentially cause serious problems. Assuminb the protection circuits in the battery work, this shouldn't be an issue though.The main problem is that the cells oxidise and stop transferring the charge to the device. This starts as soon as they are made and can't be stopped. If the oxidisation between cells is bad enough, the only use you get is from cells one side of this barrier. The battery still reports charge because the other cells still have it but they can't be usedBottom line is that the battery is poor on the Uni and lasts less than a year.Get a new one from another source, Cameron Sinio or whatever they are called are usually good.

pug said:
Li-Ion batteries do not suffer from memory effect. I have read in several tech reports on Li-Ion technology that it is actually better to top up often, like a lead acid battery.
<...>
Get a new one from another source, Cameron Sinio or whatever they are called are usually good.
Click to expand...
Click to collapse
Yeah I always put it into charger cradle when driving home -- nice way to keep it topped up.
Recently my battery started to play up and I have ordered one from BatteryUpgrade.com - a Cameron Sino battery for £18.xx has arrived quickly but could not serve the purpose - was not charging and eventually totally discharged.
Also was not indicating charge properly - always 100% (the LED is still Amber, not Green as you would expect at 100%).
I wonder if anyone else has bought Cameron Sino branded batteries and experienced same effects: 1) always 100% indication in your software and 2) lack of ability to charge?

Universal is using Lithium Polymer (light weight), not Lithium ion (heavy weight) batteries.

The main differences between li-ion and li-po batteries are the recharge/discharge rates and the construction of the core. Li-ion batteries are "wet" cells where as Li-Po batteries are "dry" which makes them thinner and more rugged. The same precautions still need to be observed and the life of the batteries is still about the same. They start becoming unusable after 300 charges and only have 40% of charge after 500 cycles. The life of 3 years is from the date of production, being stored at 40% charge and at the appropriate temperature. They are better when constantly topped up to prevent the voltage of the cells from dropping too low as this promotes oxidisation between the boundries of the cell. If they are overcharged, lithium metal is produced which is also bad. Another problem is that if the cell voltage drops too low it can never be recovered meaning one knackered battery. I have looked into this quite a bit as my battery has started shutting off at 60%ish, after 10 months of use which is pretty fair. I only expect batteries to last a year anyway. Good excuse to get a higher capacity battery in my opinion. I have used a Cameron Sino battery before in my Alpine and had those reporting issues for a few weeks and they dissappeared almost overnight. Don't know why but hey, isn't modern technology great?

Interesting. Thanks for you info. No wonder battery is not under gaurantee!

EastExpert said:
Yeah I always put it into charger cradle when driving home -- nice way to keep it topped up.
Recently my battery started to play up and I have ordered one from BatteryUpgrade.com - a Cameron Sino battery for £18.xx has arrived quickly but could not serve the purpose - was not charging and eventually totally discharged.
Also was not indicating charge properly - always 100% (the LED is still Amber, not Green as you would expect at 100%).
I wonder if anyone else has bought Cameron Sino branded batteries and experienced same effects: 1) always 100% indication in your software and 2) lack of ability to charge?
Click to expand...
Click to collapse
Yes, I've had 3 Cameron Sino batteries that all reported 100% regardless of charge level. Can't remember if the LED ever went green with them, or not, I'm afraid. Obviously, they all went back for refund.
Cheers,
Steve.

I got a CS battery and it started to expand, cracking the casing and seeming rather dangerous. I emailed the seller and it was replaced in 24 hours. He asked for theold one sent back so the factory could analyse it.
I had to dump the replacement recently because it wasn't giving the Uni enough current to complete a hard reset and was lockingup the device during 3G data and a call.
All in all I think 2 bad ones is enough, I will stick to the one that comes with the Uni and keep a USB cable curled up in my pocket =)

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.
Click to expand...
Click to collapse
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.

[Q] Non-Removable Battery novice idea

Hi Guys,
I'm new to the LG G2; so new I don't even have it yet. It's coming from Sprint soon to my doorstep. This will be my first non-removable battery device so I'm thinking and thought about this: What if while the phone was on the charger, there was some kind of a mod to bypass the battery and go straight to powering the phone? Then, it wouldn't degrade the battery and the lifespan of the battery would increase. Driving in our cars or sitting at home would just stay plugged in and not wast battery longevity. Pie-in-the-sky? Probably so, but I had to just put it out here to find out what folks that certainly know more that I, have to say.

Every modern piece of technology does that already.
It's not that charger that is causing damage to the battery. It's the charging itself.

Yes, sir, that is what I am saying also. So, what I am wondering is, is there a way to stop the charger from charging the battery, but still let it supply power to the device so the device works - basically bypassing the battery?

Idk i still charge my battery over night.
Sent from my LG-D800 using Tapatalk

The phones coming out now-a-days sometimes have some work-arounds implemented to help alleviate this condition. Some of them will switch off charging at, say 95-99% of capacity instead of charging to completely full. Others will charge to a certain high value and then switch to battery only for the first 5% or so and then start charging again.
Also, FYI, the back cover is removable on this phone if you pry where the hole created by removing the microSIM is. Supposedly it comes off rather easily. Now I know removable back and removable battery are two different things but it is at least looking up!

[Q] Battery Preservation

Dear L2 G2 owners,
I really love my battery on my LG G2 and since its not removable i want to do the best to preserve its lifespan.
So what i'm doing is, plugging in my phone to the charger when i get home and leave it there even after its been completely charged.
Is that correct or should i leave the battery to complete its cycle then charge it when its almost empty.
What other tips would you suggest.
Cheers!

Cienight said:
Dear L2 G2 owners,
I really love my battery on my LG G2 and since its not removable i want to do the best to preserve its lifespan.
So what i'm doing is, plugging in my phone to the charger when i get home and leave it there even after its been completely charged.
Is that correct or should i leave the battery to complete its cycle then charge it when its almost empty.
What other tips would you suggest.
Cheers!
Click to expand...
Click to collapse
From what ive read thats exactly how youll reduce your batterys life span
Sent from my LG-D802 using xda app-developers app

The more cycles, the shorter the life span. The thing that will destroy the most is heat. These are good batteries, trickle won't do much, heat is the worst. Don't worry so much about it. Nothing you do is going to have much of a noticeable impact.

Thanks a lot for the info guys!
Sent from my LG-D802 using Tapatalk

Btw, these batteries are indeed replaceable. Just not in a normal way, and more difficult than say a MAXX. The back cover does come off. Just a thin plastic back that can be removed going clockwise from SIM tray.

Steamer86 said:
Btw, these batteries are indeed replaceable. Just not in a normal way, and more difficult than say a MAXX. The back cover does come off. Just a thin plastic back that can be removed going clockwise from SIM tray.
Click to expand...
Click to collapse
Clockwise while facing the screen or facing the back?
Sent from my LG-D802 using xda app-developers app

Screen to you. Easier to place back starting at bottom and working up to top a side at a time. Just my personal experience.

Any available online stores that provide such replacement batteries?
Also is there a video tutorial on how to open the back cover.
Just in case...
Sent from my LG-D802 using Tapatalk

Lithium batteries
Cienight said:
Dear L2 G2 owners,
I really love my battery on my LG G2 and since its not removable i want to do the best to preserve its lifespan.
So what i'm doing is, plugging in my phone to the charger when i get home and leave it there even after its been completely charged.
Is that correct or should i leave the battery to complete its cycle then charge it when its almost empty.
What other tips would you suggest.
Cheers!
Click to expand...
Click to collapse
I've done a little research on batteries from such places as Battery University, and learned a few things that might be interesting. I haven't posted enough to post links, but the location after batteryuniversity dot com is "learn/article/charging_lithium_ion_batteries" if anyone wants more information.
It seems that Li-Ion and Li-Polymer batteries are treated essentially the same; the difference is mainly in the packaging. As for charging, they do better if not charged 100%, and never discharged 100%. But one thing they say, which I was told by the salesman when I bought it (but didn't believe him at the time) is that they should not be charged while power is on. The charger is designed to trickle charge the battery, coming on at a certain voltage. But when under power, this cycle happens too often and stresses the battery too much. I suppose it might be OK to charge it while on if you watch it, and remove the cable when it gets to full charge or just under that. I suppose a timer would be ideal.
I just wish I knew how much difference it actually makes, since turning it off means you can't receive calls. I've had devices with Lithium batteries in the past that were left on a charger all night, and the batteries seemed to last for several years, which is probably longer than my phone really needs to last.

I still think its funny that people don't think that there isn't any charging logic in the phone and that it just willfully commits battery suicide if the user doesn't micromanage charging.
Back in the day, early battery tech such as NiCad was extremely sensitive to temperature and the chargers weren't designed with intelligence so they destroyed batteries with 'Fast' charging by overheating. Also, if you never let the battery discharge completely, the battery would start to form cadmium crystals and lower the apparent capacity of the battery. So, slow and deep cycles were the proper way to go. NiMH batteries were far superior and intelligent chargers were introduced but could still suffer the same symptoms of over heating with cheap chargers.
The idea that you can only trickle charge Lithium Ion/Polymer batteries is laughable. The rate of charge is controlled based on the temperature of the battery, if it heats up, the charging circuit clamps the current down, if it is cold it ramps it up. Also, contrary to wisdom applied to NiCad, deep discharges and full charges are harder on Lithium batteries than the earlier tech. In the mid ranges of charge the charger will go all out, when it reaches the top end it slows down to a trickle because the battery is more sensitive to stress at those charge levels. Conversely, if the battery is fully discharged, the charging circuit will start out with a trickle and speed up as the level increases.
On the G2, if there is high resistance across the data pins it stays in slow charge mode, most likely to protect USB ports not meant for charging, if there is low/no resistance it goes into fast charge mode, it thinks it must be connected a dedicated charger. If the charger or the cable gives the wrong setting to the phone the user is left scratching their head.
Luckily the AT&T car charger I bought with my Galaxy SIII works properly with my G2. Sadly the correct cable with my laptop, even with Lenovo's dedicated charging port, it stays in slow charge mode because it senses a data connection.
Edit: Also, the comment about not charging while the phone is on is another hold over from the NiCad days. Lithium technology could care less as all phones have regulated charging circuits now.

[Q] Battery expanded and broke glass back

Before anyone go crazy, it's most likely my fault. Since the battery is superglued to the phone I had to bend it pretty hard when I replaced the screen. And it was probably damaged
Anyway 6 month later my battery expanded and broke the glass back. There is a very visible bulge on the back (~1/16" thick), on a flat surface the phone wobble. I don't know when or how it happened, at some point I got the phone out of my pocket and it was broke.
I have a strong suspicion it happened while using a 2.4A/12V car charger at -25°C.
My real question (TL;DR) : Is there a risk using a 2.4A/12V car charger ? (my previous one was a 1A and it was barely charging the phone)

Doesnt matter what the current output of the charger is. The device has current limiting technology. It will max out at 1A so if your using a 2A charger your fine.
Also the car puts out 12VDC but it gets stepped down to 5V at the micro usb port. Thats the industry standard.
Now when you bent your battery you started the process of damaging it. Li-Ion batteries have a very thin sheet with paste on it and that is wound up with many layers. By bending it you probably flexed the thin sheet and that soft spot eventually broke and when that happens a chemical process begins to break down the battery. The bulging you are seeing is a buildup of gasses inside the sealed battery its self. When a battery begins to bulge its going bad. This can also happen prematurely if you expose it to over heating repeatedly OR for a long period of time, OR if you allow the battery voltage to drop to low for to long. Li-Ion just doesnt like heat or low voltage.

I concur with IAmSixNine you need to either replace the battery or get a new phone. And be sure to dispose of it properly. I had the same problem years and years ago with an old HTC touch diamond. The battery started bulging and I eventually had to remove the cover and use tape to hold it in. After a couple weeks it burst and it wasn't a pretty site... Pretty dangerous carrying around a battery that could explode in your pocket at any time.
Sent from my Nexus 4 using XDA Premium 4 mobile app

Thanks, good to know that the charger can't damage the battery, I have purchased a new battery lets just hope this one does not explode in the mean time

Ive replaced the battery, the first charge took 8hour to 90% and now it wont charger over 50% is there a way to reset the battery limit ?
Sent from my Nexus 4 using Tapatalk

let it cycle a few times to correct the battery information.
That means let it die down completely, then charge it completely. Do that a few times and if it still causing issues its possibly a bad battery.

I think I also have a faulty charging port, only the wireless charging is working now, when I plug into any usb there is the lightning icon but it says not charging. I'll switch the daughter board with the one from my other broken nexus 4 to see if it fix the issue.
As much as I like my Nexus 4, I'm not impressed by reliability. In under 2 year, I've had 2 broken screen, 1 broken bake cover, 1 expanded battery and now possibly the charging port. My nexus S and Galaxy nexus with a million drop each are still working as new

One of my friends got one and broke his before the 2 month mark. He was ribbing me about getting a case for it and making it more bulky. I was not the better man...