Advantage: Overcharge and overdischarge protection to increase the life of the battery. No memory effect, can be charged or discharged as needed without loss of capacity. Low self-discharge for maximum productivity and less downtime. CE, FCC and RoHS certified, 100% compatible with the originals. No pollution to the environment. Specifications: Voltage: 18V/20V Capacity: 3500mAh Battery Type: Li-ion Replacement Part: Worx : 50032492, 50032774, WA3230, WA3231 Compatible Models:(Ctrl + F / Cmd + F to search for your model) Worx Landroid S500i Worx Landroid S300 Worx Landroid S 390m2 Worx Landroid S Basic Worx Landroid S300 2018 Worx Landroid S300i Worx Landroid S450i Worx Landroid S450i 2018 Worx Landroid S500i 2018 Worx Landroid S700i Worx Landroid S700i 2018 Worx WR105SI Worx WR106SI.