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Can you get at the board inside the shifter? Maybe a bit of debris is short circuiting it.
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firmware update and contact cleaning spray?
Have you done these things already? When I had gunk in my shifter it made shifting intermittent, didn't do anything with battery. I presume you've tried a different cable to the problem shifter?
davidual
hippy
@kiskubai
Update on my battery drain: Its the left shifter. Tried every combination possible, including using different ports on the shifter. swapped out cables...etc.
Is there anything else I can do apart from firmware update and contact cleaning spray?