The current delivered by the cell during charging.
Charge rate is often denoted as C or C-rate and signifies a charge or discharge rate equal to the capacity of a battery in one hour. For a 1.6Ah battery, C = 1.6A. A charge rate of C/2 = 0.8A would need two hours, and a charge rate of 2C = 3.2A would need 30 minutes to fully charge the battery from an empty state, if supported by the battery.
Charge rate on WiKi: http://en.wikipedia.org/wiki/Battery_charger#Charge_rate
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