Ltpgtyuasa np21 12 12v 21ah sealed lead acid rechargeable battery mostly used as burglar alarm battery in panel units and bell boxes in the security industry can be mounted on its side as well as uprightltpgt ltulgtltligt5 year design lifeltligt ltligtheavy duty lead calcium alloy gridsltligt ltligt6 and 12 volt typesltligt ltligt12ah 65ah capacitiesltligt ltligtincorporates a pressure safety valveltligt ltligtuse in any ori