BMS (battery management system board) 4s 12v 500A w/ BT, temperature sensor, fan
(Lifepo4 4S 12V 500A BMS with Bluetooth, temperature sensor and fan. lifepo4 4S 12V 80A-500A BMS with BT, temperature sensor and fan. 1 4S 12V BMS. 5)Short circuit protection. 1 NTC Temperature Sensor.