A Sunnypex 12V 100Ah deep cycle battery is a sealed, maintenance-free battery, most often utilizing Gel technology. "Deep cycle" means it's specifically designed to handle repeated, significant discharges and recharges, making it ideal for applications like solar power systems, uninterruptible power supplies (UPS), inverters, and telecom systems. The "100Ah" (Amp-hour) capacity indicates its ability to deliver 100 amps for one hour (or 10 amps for 10 hours, as specified by the "10hr" rating, which signifies its capacity at a 10-hour discharge rate). This rating is crucial for determining how long it can power a given load. As a 12V battery, it's a common voltage for individual battery units in off-grid and backup power setups.