Yes that was me at Gateway. Stupid ground wire on opposite side of coil mount.
I replaced my batteries years ago and mine only blinks 3 times. Wish I would have went with a higher mah rating. I charge my transponder the night before I leave for the weekend and it will last all weekend. Mine will usually blink red for a day to go about 4 days total. If I get worried about it I will put it on the charger at the track for a few hours.
If yours still blinks 3 times on the original batteries don’t change them yet. It is a pain in the butt to change out if not needed.