Good question on an Optima's heat resistance ? I am in North Dakota, so our climate is a little cooler than say, the deep south or desert south west. A good flooded cell battery will generlly last 5-8 years "Here" while the Spiral cell AGM batteries seem to go 15+. both Optima and Orbital are valve regulated AGM batteries. Each cell has a little pressure relief valve that does not allow any of the electrolyte to get out unless something goes wrong and they have to relieve pressure before the case explodes.
Normally they will not gas off any electrolyte unless you seriously overcharge them, such as putting a big unregulated charger on them then walk away for a few hours, or alternator/. regulator problems where the charging voltage exceeds 14.6 volts. The only electrolyte in there is what is in those absorbed glass mat separators, so they don't have to gas off very much to wreck the battery.
The spiral cell design seems very rugged, no cell connector breakage or plate material shedding off like a conventional flooded flat plate battery.
About the only maintenance I have to do is tighten the lead cable clamp ends a bit every couple years, as lead slowly creeps away from pressure and relaxes it's grip on the posts.
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