Update. Stuck the new battery in today and ………………it works!
Having taken the fob fully apart the electronics are well protected by a rubber seal. This includes the battery and I doubt whether any water got into the delicate areas. My suspicion is that it’s effectively waterproof at shallow depth but that Suzuki don’t want to claim it is and expose themselves to claims.
What I would say to fellow Vitara owners on there that, at least in the 2020 model, it takes a CR1616 battery, not CR1620 as some battery suppliers suggest. I doubt the contacts and/or case would close on the thick one. Neither size is stocked on my local high street and short of driving to a bigger town 30 mins away, mail order was the only option. Also the fob needs a tiny jewellers cross screwdriver to open it and once inside there are fiddly parts. So if you feel the battery is weakening, a precautionary change at the kitchen table is worth considering rather than being caught away from base.
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