Hailong Battery BMS 10S 20A 13S 20A BMS Li-ion Battery pack +power switch 5V USB
If you use this BMS to fit Hailong 1-2 battery case(max 65pcs 18650 cells), then you need to choose the one with 5V USB board. This BMS is not fit Hailong 1 battery case which max can fit 52pcs 18650cells.