BikeMaster 1.5 Amp Battery Charger/Maintainer TE4-0218 The BikeMaster Charger/Maintainer 1.5AMP is perfect for keeping all of your 12 volt lead acid batteries in top condition, including: Conventional Acid Batteries (Wet), Factory Activated Maintenance-Free Batteries (FA), Absorbed Glass Mat Maintenance-Free Batteries (AGM) and Gel Batteries (Gel Electrolyte).