Adjusting the S120 battery charger

A project log for S120 Lithium charger adjustment

How to modify the 120 battery charger settings & add auto battery disconnect

david-brownDavid Brown 12/21/2020 at 00:410 Comments

I bought a S120 lithium battery charger that was setup for LIFePo batteries and needed to adjust the float voltage to standard lithium 54.6V and re-set the charge finished current level ~300mA.

This charger has 3 pots to adjust the float (constant voltage) level, the charging current (constant current) and the current level at which charging is indicated as being complete.

There is no automatic disconnect of the battery once charging is complete, so this charger cannot be left unattended during charging.