Weatherproof portable USB charger

GazM72GazM72 ✭✭✭
Does anybody run with a weatherproof portable USB charger? I was running with my Garmin 735 watch navigating over the Lake District on Saturday in terrible weather and had to top up my watch battery a few times but the charger I have isn’t weatherproof so kept getting the odd shock!

any recommendations? Thanks in advance. 
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