Quote:
Originally Posted by alexbmd
I charge it all day and only 94%
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So this might be your problem. Overcharging can kills cells in a battery.
Quote:
Originally Posted by alexbmd
3 yo
wear - first half year - 1 book at month, then 1 book at year
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This could also be it. If it was sitting at full charge for years that can also kill cells in a battery. This is more likely the warmer the area it was kept in was or if it ever got to freezing temps.
Here's why
All Lithium batteries come with a charge less than 80% & usually less than 50%. This is because sitting without discharging can kill the cells. the less power in the cells the less likely it is to happen. Though if you leave it sitting you don't want the battery to be below 20% because there will be some dissipation while it sits &, unlike other battery technologies like NiCad, Lithium batteries need a controller to charge, so if that controller doesn't have power it may not ever charge again without taking apart the battery & replacing the controller. (I don't know why the controller can't just be powered by the charger to initiate it, but I was told that isn't possible with most batteries).
So it's possible that because you left it sitting for a long time fully charged, you live in a hot area & you kept it somewhere not air conditioned, or when you charged it you left it sitting on the charger well after it was full each time your battery has lost some cells. When you have ruptured or bad cells a few different things can happen. 1.) your controller might not ever report that it is full. This is most likely your situation. 2.) Your controller may think you have more when you don't so the device might die when it says it has 10% battery left. 3.) Your controller might have a spot where the controller reads that you have 65% left, then the next second it reads that there's only 48% left. Most people will have encountered at least one of these in their lifetime, that's why.
TL/DR: - Leaving your device on the charger long time = BAD
- Leaving device unused while fully charged = BAD
Now it's possible that you had this problem before & your device didn't report it because you hadn't calibrated your battery or you had worn the battery down & the sitting on the charger for a long time was the last straw to break the camel's back. Either way the Jailbreak didn't do it, at most it might have refreshed the controller to show something that was already a problem.