Topbatt 18V 4000mAh Li-ion Replacement Battery for Milwaukee Cordless Tools 48-11-1828 48-11-1840 Made with high quality original cells with no memory effect. Offers long-lasting performance and durability. Fuel gauge onboard: Displays remaining runtime for less downtime on the job. Charging at any time will have no effect on the battery Manufacture Price ,30 days money back and 12-month manufacturer warranty.