1, It is Deep cycle GEL battery. 2, It is good for inverter & solar sysytem. 3, Cycle use 14.4-14.7v 4, Stand by use 13.5-13.8v5, Please recharge it back fully from time to time to prelong its life span. eg: At least fully recharge to 13.5v above every week. the dimension is 55cm x 27cm x 26cm.