Fat tire dual battery electric bike -spectre
   The spectre is steamoon E-Bikes dual battery mid motor electric bicycle. This style of motor is used for higher efficiency and low power consumption to get the rider longer range. The maximum 80N.m. of torque is excellent for hill climbs or mountain trails. 
  While riding, the batteries alternate. The system automatically tracks the charge states of both batteries and switches between them when it detects a charge difference of five percent. This ensures that both batteries are discharged and used in an equal manner, which significantly prolongs the service life of the batteries. If necessary, riders also have the option to use just one battery. In this case, it doesn't matter which unit the battery is attached to. The two batteries can be charged directly on the bike or detached and charged on an external charger – which is very convenient when no socket is nearby.