Quote:
Originally Posted by frostschutz
That's probably not good for the battery though. They like to be charged early. I charge mine when it's below 80%.
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Nope.. thats not quite right, a battery warning and shut off is always within the safety margins of the battery.
The reader itself is calibrated for the battery usage, so when it is shut off,there is always enough power in the battery to do this safe.
So actually,when the device shut off,the battery isn't totally empty.
A Lithium Ion battery can be damaged when really totally empty,but the cirquit prevents this and you will normally never reach this point.
It is totally safe to read until the device shut off, the warning is there only to tell you that if you don't charge you can't read anymore, it isn't telling you that it is dangerous to read any longer or the battery get's damaged.
In android devices, the battery stats file tells your reader when to start or stop,it is build by the battery cirquit itself, if you delete it (dangerous) there is most of the time 10% extra in the battery itself.
In a lot of cases,when a device is working shorter and shorter,it is only the file that is corrupt and not the battery itself,there are tools to re calibrate it (only by rooted devices and only by a professional person,it must be done by following a certain routine..)