Yuasa NP General Purpose Valve Regulated Lead-Acid Battery. VRLA battery packs contains lead calcium grids for superior life as well as an absorbed glass matt construction with no free acid.Can be installed and operated in any orientation except permanently inverted. Batteries must not be suspended by their handles (where fitted). Each cell is fitted with a low pressure release valve to allow gasses to escape and then reseal. VRLA batteries release hydrogen gas which can form explosive mixtures in the air. · · · Superb recovery from deep discharge · · Multipurpose: Float or Cyclic use · · Multipurpose: Float or Cyclic use · · Usable in any orientation (except continuous inverted) · · Superior energy density · · Lead calcium grids for extended life · · Multi-purpose: float or cyclic use · · Usable in any orientation (except continuous inverted)