MASIONE 18V 4.0AH Replacement Battery Compatible with Milwaukee 48-11-1852 M18 M18B 48-11-1850 48-11-1852 48-11-1820 Cordless Power Tools 18volts 4000mah Extended Rechargeable Lithium ion Replacement Battery Pack for Milwaukee M18 Power Tools Built in high quality battery cells, Charging at any time will have no effect on the battery. Items are CE certified, the quality is tested to be equal to the OEM products LED Light: Battery fuel gauge displays remaining run-time 30days Money Back, One Year Free Replacement Warranty, 24Hours Customers Supports.