ABL 8BBU battery control modules and ABL 8BPK battery For applications sensitive to power interruptions, the battery control modules are used to supply voltage after the network has been cut off, allowing for a back-up of the current values or the protection of certain actuators supplied with 24 Vdc. Retaining duration is 9 minutes for 40 A and 2 hours for 1 A (according to the combination of control module/battery unit and charge). Each battery module consists of lead acid batteries (two in series) and automotive fuse protection. Only these modules are compatible with the ABL 8BBU series battery control modules. Standards 7777