Definition: Capacity(容量)
• The capacity of a cell is defined as how many
milli-amp-hours (mAh) of current the cell can
store and subsequently deliver.
• One milli-amp (mA) is 1/1000th of an Amp. Some
larger cell capacities are expressed in Amp-hours
(Ah).
♦ “Rated capacity” is varies with discharge rate,
temperature, and cutoff voltage.
♦ Rated capacity is different from power or energy
• Example:
• If a cell is rated at 1000 mAh, then it can deliver
the following:
♦ 1000 mA of current for 1 hour
♦ 500 mA of current for 2 hours
♦ 200 mA of current for 5 hours
♦ 2000 mA of current for 1/2 hour