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Remove one more screw. Now 100mAh is visible. Also we can see some modules under the LCD panel. Will get there later.

SURPRISE! the MCU is barried under a blob of epoxy(

USB connector has only teo wires out for charging.

And a reset button. Definitely not waterproof. Same as USB port cap. Why putting so much effort on that buttons and seal if anything else is not protected?!

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