The battery suitable for the WR202E has a rated voltage of 18 volts, with a maximum voltage of 20 volts at no load. This means that a 20 V battery from the WORX 20V system is compatible with the WR202E. The battery has lithium-ion technology and a capacity of 5 Ah, matching the WORX 20V battery system. This makes WORX's "Akku (20 V)" with 5 Ah capacity suitable for use with the WR202E.