-Available: because the charge will occur at run time (all the while running down the ramp, and when braking) and therefore do not need to train like a typical battery life charts.
- Practical: Because charging occurs during use (while running down the ramp and braking) is not required to charge the car battery like General Electric.
- easy to use: due to the charge will occur while using (both while running down the ramp and ขณะเบรก) is no need to recharge the batteries like parking Metro General .