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==== Discharge cut-off voltage ==== This voltage is a '''loaded voltage''' i.e measured during discharging. It is when the current should be turned off during discharging. Since batteries have internal resistance, this voltage is not the "0% charge" voltage. Assume discharging to 2.5V, the voltage will climb to 3.0V or even 3.3V after removing the current. The discharge cut-off voltage is highly related to cycle life. The battery's rated cycle life is measured by charging and discharging repeatedly at predetermined voltage, current and temperature. Discharging to a higher voltage doesn't use up the full capacity of the battery but the actual life will increase. Discharging to a lower voltage gives very little gain at the cost of significant wear. Thus, the discharge cut-off voltage specification is determined with a balance of cycle life and discharge capacity.
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