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A sealed lead acid battery or gel cell is a lead acid battery that has the sulfuric acid electrolyte coagulated (thickened) so it cannot spill out. They are partially sealed, but have vents in case gases are accidentally released for example by overcharging. They can be used for smaller applications where they are turned up side down. They are more expensive than normal lead acid batteries, but they are also safer.
They use different chemicals than dry cells, so they are rechargeable.
A 12V VRLA battery, typically used in uninterruptable power supplies
Disassembled AGM battery. From left: positive plate, glass mat separator, negative plate. On the right are the five remaining cells (of the six-cell battery).
