Specifications: Voltage: 12V Capacity: 4000mAh Battery type: Li-ion Package included: 1 x Battery Why choose our Li-ion battery? 1, The 4000mAh high capacity battery provides your power tools with enough power to run for long periods of time and complete tasks efficiently; 2, Fully compatible with the original charger; 3, Made with lithium-ion cells, thus ensuring that no pollution is released into the environment; 4, The battery is designed with voltage stabilizing circuit, which can effectively eliminate the memory effect and low self-discharge rate. Tips for Li-ion battery use 1. Charge the battery after it has completely cooled down, and take proper breaks when using it in high-power tools. 2. It is recommended to use the battery at least once a month and clean the battery contacts with a cotton swab dipped in alcohol if necessary. Warm Notes: 1, Please make sure the battery you want to buy can match the brand, model and part number of your power tool. 2, Please store the battery in a dry, clean and cool place, and keep it away from heat sources and metal objects. 3, After using our batteries, please wait for them to cool down before recharge.