SOK Battery 12V 280Ah LiFePO4 Battery With Built-in Heater And Bluetooth

7 years warranty and maintenance free with a 8000~12000 cycles life span. Detachable cover with replaceable BMS and cells. Built-in heater pad for using in down to -4°F. Bluetooth4.0 , support IPhone or Android smartphone. Support connect in parallel for larger capacity. Built-in smart Battery Management System (BMS). Low temperature charging cut-off. High temperature charging or discharging cut-off. Over charging and discharging protection. Over current and short circuit protection. Battery cells auto balance. Please note for connecting in series: NOT OVER 4 Batteries IN SERIES, and make sure add the battery voltage balancer.