Optima Batteries?

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My brother had a redtop in his 01 Cobra, had it on a tender last year and was still dead come spring, we think it might of been the rust protection that was on the car when he bought it in Hawaii, now the battery is removed from the vehicle sitting on the tender on a shelf in the basement, we shall see if it keeps its charge.
 
Anyone in cold climates... Stick to lead/acid batteries.

If you live in an area where you'll see -10* then don't waste your time. Optima batteries work great in that environment when they are not going to jarred or bumped. When it gets cold out, they freeze and normal vehicles are too bumpy to keep from breaking the coiled cores inside.

They're not AS fragile when they're consistently warm. Southern states, I'd put one in anything that wasn't a rock climber or ATV of some kind.