1.Built in BMS; 2.LED on the top; 3.Longer cycle life; 4.Replacement for SLA. Feature1.Built-in automatic protection for cell over/under voltage, pack over/under voltage, charge/discharge over-current, short circuit, and over temperature.2.Support pre-charging and zero-volt charging with separate MOSFET control.3.No battery management system required.4.PowerPump cell-balancing. PowerPump ...