Be cautious about wrapping electronics. Letting water out is more important than stopping it from getting in, since you will always fail at the latter.
I think my skills with electrical tape and inner tube will, at most, have made it more water resistant than waterproof
The gaping hole in the seatpost directly above a battery now being covered should help at least
@TooTallTim started
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Be cautious about wrapping electronics. Letting water out is more important than stopping it from getting in, since you will always fail at the latter.