VRLA GEL: design life 12 years. The GEL model range offers best deep cycle durability and overall longer life. The use of high purity materials and lead calcium grids ensure that GEL products have particularly low self-discharge so that they will not go flat during long periods without charge. Supplied with M8 drilled, flat copper terminals ensuring best possible connection contact and eliminating the need for battery terminals. The batteries are compliant with both CE and UL specifications in ABS fireproof containers and come with Victron's 2 year world-wide warranty.