The Dual+ Battery system offers modular battery upgrades. The 180 Wh battery can be paired with another 90 Wh brick or the more powerful 180 Wh brick. The Dual+Battery system uses two separate bricks that combine the motor’s autonomy. The 180Wh battery will provide up to 3,5 hours of motor operation. Charging time 2 hours: All SipaBoards batteries use aerospace grade battery cells, ultrasonic welding and is encased in a special fire retardant housing.