HenryJ
Expedition Leader
An Optima battery is an Absorbed Glass Mat Spiral cell battery.
There are very few gel batteries available.Optima Batteries Website said:The YellowTop® high-performance AGM battery is one of the only true dual-purpose automotive batteries available.
The OPTIMA® RedTop® high-performance AGM battery is the ultimate high-CCA starting battery designed to deliver the strongest 5-second ignition power for a reliable start-up every time.
Installing an OPTIMA® BlueTop® high-performance AGM battery in your boat or RV means more running time and up to 3 times more recharges than what you’d get out of a traditional battery.