The IMREN 21700 4000mAh 35A Rechargeable Lithium Battery is designed to power high-drain devices such as vape mods with a 4000mAh capacity and 35A discharge rate. It provides stable performance throughout use, and ensures that the battery does not overheat or experience power drops during long sessions. https://www.vapeuniverse.co/products/imren-21700-4000mah-35a-battery