The deep cycle gel battery consists of a gel rather than a liquid, so no maintenance is required to keep the battery working properly. The gel cell deep cycle battery is manufactured using advanced valve-regulated technology with a narrow operating pressure range. It is equipped with explosion-proof acid filters to avoid acid leakage and frequent maintenance. The deep cycle battery has an extended service lifespan with a design life of up to 18 years in standby applications. The deep cycle gel battery is made of high purity materials that reduce monthly self-discharge to less than 2.5% at 77°F (25°C), 5 times lower than liquid-rich batteries. No need to recharge dormant batteries frequently. Additional information in pictures. Features. 12v 220ah Gel Valve Regulated Rechargeable Battery Non-Spillable Dimensions: 530 x 248 x 275mm Weight: 42KG What's in the box 1 x Digimark 220Ah 12v Gel Solar Rechargeable Battery- DGM-SL220AH