You can keep an extra battery with you for adventures with Maxfoot. 1. Extremely powerful 14AH 48v lithium-ion battery. Increases range to 40 miles(electric only) and 60 miles for level 1 pedal assist. 2. Long Life: the battery has strong cycle and duration performance, sufficient capacity, long life, and high durability. twice the lifetime of a lead-acid battery. It has Overcharge, over-discharge, over current and short circuit protection function. 3. Safety: our li-ion battery has been through thousands of time repetitive discharge and safety test, you can use it without worry. 4. Easy disassembly and installation of battery