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Grumpy_Git
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?