TGB, TDB Serie VRLA / SLA Batteries AGM Batteries are maintenance free batteries used in general electrical equipment such as UPS, safety, alarm systems, emergency lighting and security systems. TGEL Series Deep Cycle VRLA / SLA Battery, Dry Battery, Maintenance Free With Nano Gel AGM Technology, Gels are more resistant to Gel and M, better Disc Disc Discharge and can be used well. The light that flows is very small, suitable for receiving energy such as solar cell solar cells or wind turbines.