Robot Charging Issue

As for the robot recharging issue, we have two choices for the charging of batteries. The first one is to use voltage transformer LED and diode to build a charge and discharge circuit. The second plan is to use the wireless inductor charging.  The two choices are shown as below.

But there are drawbacks for both of them. The first one's circuit is simple but it is hard for the robot to find the charging point and connect to it automatically. The second one is easy to locate but the output current is very small and therefore we need to build a circuit to enlarge DC current.
We are still working on it.