Make sure you charge the battery for at least 18 hours (30 hours max) before operating your vehicle for the first time.  Charge the battery for at least 14 hours after each use of the vehicle.  *It is necessary to charge the battery immediately after use.  It is damaging to the battery when it has been used and then sits without being charged.  After a full charge the battery can sit up to two-three months when not in use.