VRLA AGM: design life 7 - 10 years. The AGM range has very low internal resistance making them particularly suitable for high current discharge applications such as for inverters, thrusters and winches. 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. The batteries are compliant with both CE and UL specifications in ABS fireproof containers and come with Victron's 2 year world-wide warranty.