SOLAR4.8-6.0V, the input port of power, is connected to polar panels.
The solar energy is converted into electric energy via solar panels.
BAT, the output port of power, is interfaced with the lithium battery
holder(rechargeable batteries) and saves the electric energy into batteries.
This is the switch. Slide to ON end, then the external lithium battery will be
connected, supplying to the expansion board; on the contrary, slide to OFF,
then the current of lithium battery will be disconnected.
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