Lifepo4 BMS PCB 4S 12V 20A Daly Balanced Waterproof Battery Management System UK
You will need skill and knowledge to install it and use it. BMS manufactured by high quality Mos and IC imported. Model: DL4S (3.2V Rated LiFePO4) NOT for 3.7V Li-ion batteries. 4S 12V 20A Protection board with balance.