1S 2A Battery Management Systems (BMS)

BMS For A Single Battery String And 2A Max Current

BMS often ship in locked state: no output voltage is available at the output pins. Locked state is also entered whenever over-current protection was triggered. To unlock the BMS, connect it to a charger. If you did not add a dedicated charger board, apply the appropriate charging voltage to its output terminal.


LiIon LiPo

For currents up to 2A, you can use a tiny BMS:

This board often goes by the model number HX-1S-3038.

The solder pads for the battery are available on both sides and marked B+ and B-:

Due to the small size, all markings are printed on the back side only:

The output voltage is available at the terminals P+ and P- in the middle of the backside.


Protection Threshold
Operating Current 2A
Upper Peak Current 2.5A
Over-Charge >4.25V
Over-Discharge <2.5V
Short-Circuit Protection yes, delayed self-recovery
Size 30x3.7x2.2mm


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(content created Mar 24, 2024)