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This blog investigates how the BBC micro:bit power supply circuitry works. I have been trying to interface the micro:bit with different peripherals and planned to run it off a 4.2 volt lithium-polymer battery, however it was not clear if it is safe to run it off a Li-Po battery. The manual only says it can run off 2 AAA batteries, which might supply a little over 3 volts. The technical documentation for the device is still very sparse and for the types of things I am doing there are no example ...