... 1.Built-in automatic protection for cell over/under voltage, pack over/under voltage, charge/discharge over-current, short circuit, ... cells, resulting in longer run-time and improved cycle life.5.Maintenance free6. Optional SMBus communication interface to monitor ... voltage, current, temperature, SOC, ect.12v 60ah lithium battery pack Specifications12V-60AhVoltage14.8 V Nominal Capacity (C/5, 23°C ...