Battery Voltage: 20V | Capacity: 4.0Ah | Type: Lithium | Replacement for Worx 20V lithium battery WA3525 WA3520 WA3578 WA3575 WA3512 WA3522 WA3544. WA3525 Battery: Replacement for Worx 20V battery and compatible with Worx 20V battery charger WA3732, WA3731, WA3875, WA3770, WA3742, WA3847. Works Fine: 20V PowerShare battery provide extended runtime, fully compatible with Worx 20V/40V cordless tools WG151, WG155, WG251, WG255, WG540, WG890, WG891, WG284, WG644, WG584, WG743. Improved Performance: No memory effect, with protections of overcharging and over discharge, perfect replacement for Worx 20 volt battery. Support Service: 90 Days Money Back and 1 Year Warranty. Comply with FCC RoHS and CE security testing standards.