Avago Technologies Cache Protection for RAID Controller Cards - Manual (Page 136)

Avago Technologies
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Cache Backup Products for MegaRAID SAS+SATA RAID Controllers User Guide
May 2015 Battery Glossary
Battery Glossary
Absolute state of charge
Predicted remaining battery capacity expressed as a percentage of Design Capacity. Note that the Absolute State of Charge
operation can return values greater than 100 percent.
Auto learn mode
The controller performs the learn cycle automatically in this mode. This mode offers the following options:
BBU Auto Learn: Firmware tracks the time since the last learn cycle and performs a learn cycle when due.
BBU Auto Learn Disabled: Firmware does not monitor or initiate a learn cycle. You can schedule learn cycles manually.
BBU Auto Learn Warn: Firmware warns about a pending learn cycle. You can initiate a learn cycle manually. After the learn cycle is
complete, the firmware resets the counter and warns you when the next learn cycle time is reached.
Auto learn period
Time between learn cycles. A learn cycle is a battery calibration operation performed periodically by the controller to determine
the condition of the battery.
Average time to empty
One-minute rolling average of the predicted remaining battery life.
Average time to full
Predicted time to charge the battery to a fully charged state based on the one minute rolling average of the charge current.
Battery module version
Current revision of the battery pack module.
Battery replacement
Warning issued by firmware that the battery can no longer support the required time.
Battery retention time
Time, in hours, that the battery can maintain the contents of the cache memory.
Battery status
Operating status of the battery. Possible values are Missing, Optimal, Failed, Degraded (need attention), and Unknown.
Battery type
Possible values are intelligent Battery Backup Unit (BBU), intelligent Battery Backup Unit (iBBU), intelligent Transportable Battery
Backup Unit (iTBBU), and ZCR Legacy.
Current
Measure of the current flowing to (+) or from (-) the battery, reported in milliamperes.
Cycle count
The count is based on the number of times the near fully charged battery has been discharged to a level below the cycle
count threshold.
Design capacity
Designed charge capacity of the battery, measured in milliampere-hour units (mAh).
Design charge capacity remaining
Amount of the charge capacity remaining, relative to the battery pack design capacity.
Design voltage
Designed voltage capacity of the battery, measured in millivolts (mV).
Device chemistry
Possible values are NiMH (nickel metal hydride) and LiON (lithium ion)
Estimated time to recharge
Estimated time necessary to complete recharge of the battery at the current charge rate.
Expected margin of error
Indicates how accurate the reported battery capacity is in terms of percentage.