2V 600Ah Deep Cycle Sealed Gel Solar Battery Cell by HAZE. Gel Solar Batteries are the most expensive in the lead acid family (about 10% more than AGM), but here you get what you pay for, and Gel batteries deliver the goods. Gel batteries are constructed using high grade materials and electrolyte. Gel batteries need the lowest charge current and voltage to be recharged, contrary to belief it does not mean that they charge slower than floods or AGMs. They are the most reactive chemistry in the lead acid family and Gel batteries get over twice the cycle life over AGM batteries. I’ve seen Gel batteries get over 3000 cycles at 50% DOD when properly maintained. They also handle high ambient temperatures much better than AGM or floods. With their high cycle life and low charge characteristics make them the ideal battery for solar energy storage.