You can also use them to change the charging current
Settings
After battery placement, press the C button to select a slot or press the button repeatedly to select a specific slot from left to right order, when a desired slot is selected, holding down the C button allows for manual adjustment to charging current, and holding down the V button allows for manual adjustment to voltage.
·Current setting
This option allows the charging current to be set at 1.5A for batteries of large capacities. The red light on top will turn on when the charging current to set at 1.5A.
·Voltage setting
This option allows the charging termination voltage to be set at 4.35V/4.2V/3.7V
Note: (2) Charging current allocation can be manually adjusted when more than one batteries of large capacities are placed in the charger