I have used the YELLOW top optima battery for years, have several in my toys. I have one in my Bronco and I can pull with my winch ,what seems like forever.
I have two of the red top versions in my offshore boat, but the real secret is go to a local auto parts supplier, mime is Quest. They carry a small trickle charger
that puts out 1.5 amps slow and steady. when the amperage falls down the charger kick on. The little charger will keep your big batteries HOT.Seems like I paid less than
$50.00 for the charger. It will keep your Big batteries Hot and ready to go......Good Fishin to YA...