Heat Kills Batteries
Here in balmy Phoenix, regular wet-cell (the kind you can add water to) batteries last 18 to 24 months. Sealed wet cells evaporate and won't last as long as that. When a battery dies here, it normally does so with no warning. It's OK at lunchtime, and then a half hour later, dead and can't be charged. When that happens 25 miles from pavement in July at 119F, the back country tow cost is breathtaking.
Yeah, I can get a pro-rata wet cell battery for $25. But when that happens I've had to change all my plans for the day, or maybe pay someone several hundred dollars to extricate my truck.
The OEM batteries on my `96 lasted 16 months. I replaced them with red top Optimas. Last year, before two round trips St. Louis, I replaced the Optimas thinking that maybe there was a chance they might possibly be potentially weak, maybe. (Silly me. ) I put them on my travel trailer 's tongue and began using them as deep cycle batteries. The old Optima red tops, which are not deep cycle batteries, are in perfect working order, and in used condition have held up better than any new wet cell deep cycle battery I've ever had on the trailer.
Since I went to Optima, I have not had a battery failure in six years. It's worth the extra money to me. I make up for the extra cost by eating ramen noodles instead of regular food.