The WORX quick charger is for use on the WA3520 20-Volt LithiumMAX battery. The quick charger will charge the battery in less than one hour so less downtime in between charges. The 84-inch charger cord combo provides enough length to access power to charge the 20-volt battery anywhere. This replacement charger is for use with any 20-Volt MAX series WORX tools to include: WG155, WG155.5, WG255, WG545. We can upgrade the 18-volt battery and charger to the 20-volt series as these 20-volts will fit on WORX 18-volt models.