LEAD ACID BATTERY C {LARGER SEC-Series 3 Stage Lead Acid Battery Charger 12VDC 5A 8BC 2105 Description SEC-2105 Is a compact, efficient switching mode charger for sealed and wet types of lead acid battery. In the Bulk Chars stage it supplies In & constant current mode until the battery voltage reaches to the set V absorption level, charging mode then changes to Absorption Stage.