Finally, this slide shows that charging a cell too fast can degrade its performance over time. For a 900 mAH rated battery, the “C” rate is 900mA. In particular, for most Li-Ion batteries, it is recommended to recharge slightly lower than the “1C” rate, so the overall charge time may be in the 90 minutes to two hours range. However, some new cell types are optimized for high power applications, and allow high rate charging, so this data may not apply to all battery types.

