18650 lithium battery
The rated voltage of a single cell is generally: 3.6V or 3.7V
The charging voltage is generally : 4.20 V (lithium cobalt oxide is 4.2 V to 4.3 V)
The minimum discharge termination voltage is generally: 2.75 V. Voltage below this voltage can easily lead to a significant reduction in battery capacity or even its disposal.
Maximum charging termination voltage: 4.20 V