This is a high quality Lead Acid battery that uses AGM/Gel Technology for a long lasting and improved performance under harsh conditions. The 200Ah AGM Battery - Grey (CE200-12) is a rechargeable battery of 12 volts that uses a lead-lead dioxide system, the absorbent glass matt battery has a very low self-discharge, this means that it can sit in storage for much longer periods without charging than standard batteries. Should the battery be accidentally overcharged producing hydrogen and oxygen, Special one-way valves allows the gases to recombine thus preventing loss of water through electrolysis avoiding excessive pressure build-up. The battery is completely sealed and is therefore, maintenance-free, leak proof and usable in any position. This is a high quality Lead Acid battery that uses AGM/Gel Technology for a long lasting and improved performance under harsh conditions. The 200Ah AGM Battery - Grey (CE200-12) is a rechargeable battery of 12 volts that uses a lead-lead dioxide system, the absorbent glass matt battery has a very low self-discharge, this means that it can sit in storage for much longer periods without charging than standard batteries. Should the battery be accidentally overcharged producing hydrogen and oxygen, Special one-way valves allows the gases to recombine thus preventing loss of water through electrolysis avoiding excessive pressure build-up. The battery is completely sealed and is therefore, maintenance-free, leak proof and usable in any position. This is a high quality Lead Acid battery that uses AGM/Gel Technology for a long lasting and improved performance under harsh conditions. The 200Ah AGM Battery - Grey (CE200-12) is a rechargeable battery of 12 volts that uses a lead-lead dioxide system, the absorbent glass matt battery has a very low self-discharge, this means that it can sit in storage for much longer periods without charging than standard batteries. Should the battery be accidentally overcharged producing hydrogen and oxygen, Special one-way valves allows the gases to recombine thus preventing loss of water through electrolysis avoiding excessive pressure build-up. The battery is completely sealed and is therefore, maintenance-free, leak proof and usable in any position.