I had the same issue. Got the warning, changed battery (took from spare fob).
Still got warning. Found other thread that stated that fob sends voltage info to car and needs 5 consecutive "ok voltage interactions" before the message disappears.
So, I realized that I had probably only interacted 2-3 times when googling the problem. Went down to car, clicked lock/unlock a couple of times and then no more error message.
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