The Zetrex 12 V 220 Ah tubular battery is a deep-cycle, tall tubular lead-acid battery built for inverter or solar backup duty. With 12 volts nominal voltage, it delivers about **2.2 kWh** of usable energy (depending on depth-of-discharge), designed to sustain heavy loads during frequent outages. The tall tubular plates increase active surface area for better charge acceptance, durability, and long life, particularly in cyclic discharge-recharge applications.