Replacement 48V 10Ah lithium-ion battery for the 2015 – 2020 Summit electric bike kit. Range of 25 – 40+ miles. Built from certified Samsung cells. This could also serve as an extra battery for very long rides, but only if you have already previously purchased one of these replacements, as this item includes a new battery mount / dock with an updated attachment mechanism that does not match up with the original Summit battery.