Antigravity Lithium Battery Charger - 4 Amp Harley Motorcycle DK-AG-4AMP Comes with Clamps and Harness for attaching to the battery so you can charge while it is on the bike. 4 AMP Charge Rate, LED Notification of Charging and Fully Charged Short Circuit Protection, Battery Polarity Error Protection Over Voltage Protection, Over Heat Protection Voltage Precision +/- 1%