Ultra Light and slim battery pack from Reention. USB socket and total security with lock . 2 year warranty . smartcharger recommended and additional $70 . Panasonic cells are the best and so are the Hardcase manufacturers Reention . Make any Pedego modern again, Avanti Inc , etc . Call us for trial fitting . weight 2200 grammes  13Ah / 470Wh is packed with high quality Panasonic18650 cells in 10S4P configuration.