Sun Xtender® Deep Cycle renewable energy and solar batteries are produced to the same premium quality standards as the aircraft battery line with the absorbent glass mat (AGM) design adopted by the military. Sun Xtender® offers a wide range of sizes and capacities to meet the specifications of any renewable energy project. Sun Xtender® offers the most comprehensive selection of 12 Volt, 6 Volt and 2 Volt renewable energy batteries in the market today.