Nope, leave it in there and just check your watches once in a while. I figure it's better to leave my watches running rather than let them sit dead so to speak. Also makes them useless and I wear all mine so I'd hate that. Just don't leave a dead G too long before you replace the battery, just in case it might leak.
Interesting question, which brings me to an additional battery question. Has anyone had a battery leak and the watch is still working fine ie: doing damage and tricking you into thinking it's all fine. Ideally I would only change a battery if it was dead (easy to spot from the outside) which would hopefully avoid the leakage issue also. However if they can leak and work that's a whole new ballgame.
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