18V 2.5Ah Li-ion Battery. Press button for easy disassembly and quick replacement, button press life times can reach more than 50,000 times. Built-in BMS control system, extend battery life. Slide rail design can be integrated more closely with tool. Lithium battery cores is from famous manufacturer; charge and discharge times can reach 350 times. Impact-resistance plastic steel shell to strengthen battery protection, 1.2M drop test verification passed. LED fuel gauge charge indicator. Battery is with low voltage, over current, over temperature, unbalance detection, short circuit, and low power consumption protections. Conductive metal sheet clamping design on the battery reducing the contact resistance, and enhance the performance of the tool. 18V 2.5Ah Li-ion Battery