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CCS/TM4C123GH6PM: Power supply for Tiva C launchPad

Part Number: TM4C123GH6PM

Tool/software: Code Composer Studio

Should I directly use 18650 battery to supply tiva launchPad or use a boost 4.2V -> 5V ?

Can supplying 4.2V in long-term damage the board ? 

Thanks and Best Regards.