lithium powered radio control car

fingers said:

I'm doing a uni project making a solar powered radio controlled car. The solar panel i have is 6V 600mA. I want to have the solar panel constantly charging lithium batteries (as these are very light!). These batteries need to be connected to the speed control, which i have, which in turn is linked to the motor and the reciever/servo.

Does anyone know what bateries to use, how to charge lithium batteries, and what i need?!

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