7.10 Battery maintenance.
Batteries used in the BU-872 are of Lithium-ion type. To obtain maximum battery capacity, it might
be necessary to perform a maintenance charge or a balance procedure.
Maintenance charge.
Maintenance charge should be performed:
• When used as Man Portable or Last Resort with external power connected for a
continual time, lasting more than four weeks : every other month.
Maintenance charge is performed by disconnect the external power and then reconnecting the
external power.
Balancing procedure.
Balancing procedure should be performed:
• When used as Man Portable with frequent charge cycles: once a year or when battery
capacity is noticeably reduced.
• When used as Last Resort with infrequently charge cycles: once a year.
7.11 Balancing procedure instruction.
• Disconnect TR-810 and external power connected to the BU-872.
• Remove the two screws situated in the front, see fig. 8.1
• Remove the two screws situated in the back, see fig. 8.2
84417_O&I_TR-810_E Battery Backup Unit Page 7-14
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