When your battery has fully discharged, or if it is not used for a long time, the battery will need to be recharged as follows:
1. Match the anode of the battery with the anode of charge machine, and the cathode of the battery with the cathode of charge machine.
2. Continuously charge in voltage mode U = 2.40V ~ 2.50V (with 2V battery type) and U = 14.4 ~ 14.5V (with 2V battery type). Maximum load line should be less than 1/4 of the capacity of the battery.