https://www.anern.com/products/deep-cycle-opzv-tubular-gel-solar-battery/ Deep Cycle Opzv Tubular Gel Solar Battery The OPzV solar battery series is a tubular colloidal battery from Anern solar light. By using a diecasted positive grid and patented active material formula, Anern solar tubular battery is very suitable for cyclic use under extreme operating conditions. This series is recommended for telecommunications, outdoor, renewable energy systems, and other applications.All Rights Reserved