The Engwe offers lithium-ion batteries for the E26, M20, Engine Pro, EP-2 Pro, T14, L20, X24, X26, P26, C20, and EP-2 Boost, Engine X E-Bike models. Specifications such as a standard voltage of 48V and a charging time of about 6-6.5 hours. The battery does not come with a charger, which needs to be purchased separately by contacting service2@engwe-bikes.com if required.