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Its the same connection that you have at your RD, and I imagine they must get occasionally submerged in water with the more adventurous riders. I guess those connections would be rated for at least IP-spalshy-proofy (cant be bothered to look up the exact codes).
Cleaning out the connection wont hurt though, if it resolved your issue then you've got your answer, and you can consider silicon...etc
PS: If anyone got a spare DN-110 battery they want to sell, let me know!
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From Shimano
Di2 is a closed system, completely waterproof and sealed from the elements, its operation unaffected by the weather.
ALWAYS grease your seat post though.
kiskubai
Grumpy_Git
@Sergeant_Pluck
I’ve been getting some serious drenchings lately and it’s reminded me of a slight concern I have re my seatpost Di2 battery. It’s a gravel bike, with a rear-facing slot in the seat tube. No mudguards (I’d probably have to get smaller tyres than the current 40s if I wanted to fit them) so the top of the seat tube and seatpost are unprotected.
I’m sure there must be at least some water seeping in down the inside of the seat tube. Is this a concern with a battery in the post and the wiring down there? It’s not a Di2 specific post, so the battery is just jammed in there with the flanged Shimano rubber battery holder.
I’ve seen things like the Fizik seat post ring, but I’m not convinced that it would stop much as it would just rest on top of the seat post collar. I’ve read of people putting silicon sealant in the seat tube slot, which I think might have some effect.
Is the battery and wiring designed to handle a bit of water ingress or, if not, what’s the best thing to do?