BMS circuit board for 3S Battery. Its supports Lithium Ion battery of 18650 model 3.7v rated. For battery pack You can use BMS. This is max 10A BMS. The Load current should be limit to 10A for this BMS. Load current does not mean AH. Please remind both are different. AH does not mean Ampere. You can use this BMS in your 20ah or 30ah battery also if the load current or charge current is below 10amps. Plz do not short Circuit the battery. The positive and negative terminal should not attach together at any condition.
Battery Management System 3S or 11.1v 20A circuit board.
 
For 3 series battery of Lithum ion 18650, you can increase the no of battery but voltage should be 11.1 or 12.6 max. Its max current limit is 20A.
Package Include- 
1x 3S 20A BMS circuit