DA.BT2 = 12Vdc 2.1Ah battery (2 required)
DA.BT6 = 12Vdc 7Ah battery (2 required)
2 x DA.BT2 are supplied as standard with battery back up kits (BRAINY.24CBY etc etc)
DA.BT6 or DA.BT18 are recommended for higher duty cycles and longer battery life
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