Originally Posted by ohmygod
Is it better to charge the my BB when I turn off the device? If I charge the BB device without totally turn off, is there any harm to the device?
Do a search under "lithium" and you should be able to find my threads and posts discussing battery charging.
NEVER do a complete discharge of a lithium battery, so to "refresh" it or whatever. That was a procedure for old nicad and hydride batteries to get rid of or prevent the memory effect.
NEVER let your battery discharge down to zero. That may ruin a lithium battery.
Your Pearl battery is good for about 500 to 700 full charge/discharge cycles. This does NOT mean how many times you charge the phone, it means how often the "cells" are fully charged and discharged. Your battery cells "keep track," so to speak, of how many times they are fully charged and discharged.
Generally, a lithium battery will last about three to five years before the cells die, at which time the battery will hold less of a charge or simply die completely. This gradual decline of lithium batteries takes place regardless of whether you use the battery or not. If it sits unused on a shelf for five years, it will NOT last five years from that point. Odds are it will not charge up because five years have come and gone.
Contrary to myth, it is better to charge a lithium battery from time to time. Not charging a lithium battery actually damages it, especially if you let it discharge completely.
It does not matter if a device is on or off when charging. Charge rate may be affected, but the battery itself won't care.
Lastly, and this is extremely general, a lithium battery sitting unused on a shelf or in a drawer discharges at a rate of about 10% a week.
All of the above applies to any lithium battery, not just the Pearl's.