The Ritar 35Ah battery (often model RA12-33) is a 12-volt sealed lead-acid (SLA) AGM, maintenance-free, rechargeable battery designed for high-rate discharge, reliability, and long life in deep-cycle applications. It typically features a 7.68–7.76 inch length, 5.16 inch width, and 6.3–7.13 inch height, weighing roughly 23–25 lbs.