A 12V 220Ah GEL battery is a deep-cycle, maintenance-free battery type where the electrolyte is immobilised (gelled), so there’s no free liquid acid. It delivers around 220 ampere-hours at 12 volts, making it suitable for long backup times for solar systems, inverters, telecoms or off-grid setups. It offers good resistance to vibration, lower risk of leakage, and reduced maintenance compared with flooded batteries. Lifespan depends on cycle depth and charging practices, but high quality units can deliver several years of reliable service.