PERC H700 Integrated battery state "unknown"

OMSA on Dell PowerEdge R510 is displaying state "unknown" on PERC H700 controller battery:

Properties:
Name: Battery 0
State: Unknown
Battery Tasks: No Task Available

What does this state "unknown" mean?

Following is the controller log:

T35:        *** BATTERY FEATURE PROPERTIES ***
T35: _________________________________________________

T35:        Auto Learn Period     : 90 days

T35:        Next Learn Time       : 481276924
T35:        Battery ID           : 3f9c164cz
T35:        Delayed Learn Interval: 0 hours from scheduled time
T35:        Next Learn scheduled on: 04 02 2015   8: 2: 4
T35: _________________________________________________

T35:        *** BATTERY DESIGN INFORMATION ***
T35: _____________________________________________

T35:        Design Capacity         : 1800 mAh
T35:        Design Voltage           : 3700 mV
T35:        Specification Info,     : 31
T35:        Date of Manufacture     : 12,28 2011
T35:        Serial Number           : 5708
T35:        Pack Status-Config       : 14
T35:        Manufacturer Name       : SMP-SDI2.0
T35:        Device Name             : DLFR463
T35:        Device Chemistry         : LION
T35:        Design Data             : 80dbdb4b
T35: _____________________________________________

T35:        *** BATTERY CAPACITY INFORMATION ***

T35: _____________________________________________

T35:        Relative State of Charge : 97 %
T35:        Absolute State of Charge : 87 %
T35:        Remaining Capacity       : 1557 mAh
T35:        Full Charge Capacity     : 1611 mAh
T35:        Time to Empty             : 65535 Min
T35:        Average Time to Empty     : 65535 Min
T35:        Average Time to Full     : 405 Min
T35:        Cycle Count               : 37
T35:        Max Error                 : 2 %

35: _____________________________________________

T35:        *** BATTERY MONITORED INFORMATION ***

T35: ____________________________________________________________________________

T35:   Temperature             : 26 C                                 Voltage             : 4028 V
T35:   Current                 : 126 mA                   GasGaugeStat       : 40a0
T35:   GPID                   : 8110792                                   ChargerStatus       : 2
T35:   Remaining Capacity     : 1557 mAh Full Charge Capacity: 1611 mAh
T35:   Relative Stat of Charge : 97 %                          FwBBUState         : 1

T35: ____________________________________________________________________________

T35: Battery Init over

Thank you.