1S 10A Battery Management Systems (BMS)

BMS For A Single Battery String And 10A 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 10A, you can use a variant of a BMS that was originally designed for 2S configurations.

The 1S and the 2S version of this board look very similar. Make sure you check the number of solder pads on the front side. The 2S version has five main solder pads. The 1S version has just three.


This board is small and rugged but the solder pads are poorly marked, and since there are only three solder pads, one serves as common + both for the battery and the output voltage.


When you look very closely and carefully, two solder pads are marked B+ and B- on the front side. The B- pad is also available on the backside (the B+ pad is not).

Connect the battery to B+ and B-.

Output Voltage

The output voltage is available at the solder pad marked C- (which is also available on the backside) and the same B+ pad that was already used to connect the battery. Both battery and output voltage share the pad B+.


Protection Threshold
Continuous Current 10A
Overcurrent Protection 60A, delay max. 1.5s
Overcharge Protection 4.25V, recovery <4.18V
Discharge Protection <2.8V, recovery >3V
Short-Circuit Protection yes, 300us delay, release by load disconnect
Charging Current 25A

While you theoretically could charge your battery through this BMS, its current limiting functionality is useless for most battery types: the current is limited to 25A. Most power supplies you may use for charging cannot exceed this limit even if they wanted. And many simple 1-cell batteries cannot handle a charging current of 25A (for a 2.500mA cell this is a 10C charging). Always check the battery specs or better yet use an additional dedicated charger board.


Please do leave comments below. I am using utteran.ce, an open-source and ad-free light-weight commenting system.

Here is how your comments are stored

Whenever you leave a comment, a new github issue is created on your behalf.

  • All comments become trackable issues in the Github Issues section, and I (and you) can follow up on them.

  • There is no third-party provider, no disrupting ads, and everything remains transparent inside github.

Github Users Yes, Spammers No

To keep spammers out and comments attributable, all you do is log in using your (free) github account and grant utteranc.es the permission to submit issues on your behalf.

If you don’t have a github account yet, go get yourself one - it’s free and simple.

If for any reason you do not feel comfortable with letting the commenting system submit issues for you, then visit Github Issues directly, i.e. by clicking the red button Submit Issue at the bottom of each page, and submit your issue manually. You control everything.


For chit-chat and quick questions, feel free to visit and participate in Discussions. They work much like classic forums or bulletin boards. Just keep in mind: your valued input isn’t equally well trackable there.

  Show on Github    Submit Issue

(content created Mar 26, 2024 - last updated Mar 28, 2024)