Hi, this is a 3S 40Amp BMS that I've used for my 12V power bank that utilizes car 12v chargers to charge my stuff. Basically a 3s9p configuration for for 18650 2500mah
How To Make 12v Battery Using 3s BMS Circuit | 3s 12.6v Cell Li-ion 18650 Battery Pack - 25amps DIY - YouTube
12V 3S 7P 40A Li-ion 18650 AA Battery Power Display Case +Holder +BMS+Shrink | eBay