6”L x 3.25”W x 1” H. 13 ounces. From a full charge, can operate wheel for a max of 12 hours. Comes with charger and cable to run wheel, charge, or both at same time. Has USB port for phone/tablet charging with your cable. For longest life, when not in use please store battery at a medium level of charge (and then fully charge the day before planned use). Do not attempt to charge with anything other than the supplied charger.