Our favorite battery yet! Built in volt meter on select models, gripper bottom panel, and included shimming foam. BikeMaster Lithium-Ion Batteries for Street The most advanced high-power Lithium-Iron Phosphate battery technology available for your bike. BikeMaster® Lithium-Iron Phosphate batteries will provide you with ultra-high cranking amps and twice the service life of a conventional battery. At 1/3 the weight of a lead acid battery, these batteries contain no corrosive liquids and no heavy metals, making them environmentally friendly. All BikeMaster® Lithium-Ion batteries come with a two-year warranty.