Sounds like a pre-emptive strike at 3 years on a Deere battery is a good idea. Randy, I'm sure you checked this but was the water over the cells? I don't use a trickle charge out of fear of boiling off water. Seems some batteries die the second any part of the plate is exposed. I've seen the "battery maintainers" that claim to not overcharge the battery, I just don't trust electronic stuff :mocking:. For my generator and deep discharge battery for emergency lighting for the house, I build a charger. The main win is it doesn't go over 13.8 V no matter what. Only loss is after 4 years, the sulfur build up means get a new battery.
On my generator, I just change out the battery every 3 years with a WallyWorld special.
Finally, let me quote my departed father's wisdom on this topic:
"There are 3 things modern man will never understand. Economics, Women, and Batteries."
Between the state of the nation, the fact that most of us here are married, and Randy's woes, I'd say the old man was hitting on all cylinders :laugh:.
Pete :morning2: