The 4A Charger is the perfect charger with many advantages: It charges quickly is easy to use and is visually appealing. The compact and lightweight charger is ideal for when on-the-go and quickly supplies the PowerTube 750 with the necessary energy: It takes six hours to fully charge the battery and just over two hours for a 50% charge.Compatible with components of the smart systemCharging time for PowerTube 750: 50% in approx. 2.3 hours 100% in approx. 6 hoursCharging current: Max. 4 AAC rate voltage: 100-120vCable lengths: Power cable: approx. 1.5 m battery cable: approx. 1.0 mPlease note: the smart system is not compatible with the Bosch eBike System 2