About this item AGM Technology. Factory Activated. Sealed Maintenance Free Battery. No acid pack needed. ITEM#: GT4B-5-BS , BT-AGM-YT4B-BS(MF) Battery Family: Maintenance Free Battery Type: YT4B-BS YT4B-BS(MF) is a sealed maintenance free battery. This battery is factory activated with AGM technology. No water addition and no acid pack needed!! You just plug in and play!! Please check size before buying.












