Have you been in contact with Wahoo about it? I'd hope that they may offer you a discount if the issue is a deteriorating battery that can't be replaced.
Not yet, I wasn't sure how worthwhile that was since it's 3 years old but I guess no harm in trying.
3yrs old isn't that old. I still use a Garmin 800 I got in maybe 2011 that has more battery life than that.
@andyfallsoff started
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Have you been in contact with Wahoo about it? I'd hope that they may offer you a discount if the issue is a deteriorating battery that can't be replaced.