This boost buck converter can be used as a 35w regulated power supply as well as a CC CV battery charger. It is variously known as: DC-DC Constant Voltage current Step-down Programmable Power Supply module L2KE or
CNC buck boost Power XY-SK35 or other names

The instructions for use is below:
From manufacturer--
Use as battery chargerProducts without constant current function can not be used to recharge batteries. Because of the great voltage difference between batteries and chargers, the charging current is too large and the batteries are damaged. So the batteries should be charged with constant current at the beginning. When the charging reaches a certain level, the batteries should be automatically switched back to constant voltage charging.
(1) Determine the floating charge voltage and current of the rechargeable battery you need; (If the lithium battery parameter is 3.7V/2200mAh, the floating charge voltage is 4.2V, if it is 12V rechargeable battery, the floating charge voltage is generally set to about 14V).
(2) Under no-load condition, set the voltage value to make the output voltage reach the floating charge voltage; (If charging 3.7V lithium battery, adjust the output voltage to 4.2V only)
(3) Setting constant current value (charging current of battery) under no-load

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