root@hv: ~ $ megacli -adpbbucmd -a0

BBU status for Adapter: 0

BatteryType: iBBU08
Voltage: 4031 mV
Current: 0 mA
Temperature: 40 C
Battery State: Optimal
Design Mode  : 48+ Hrs retention with a non-transparent learn cycle and moderate service life.

BBU Firmware Status:

  Charging Status              : None
  Voltage                                 : OK
  Temperature                             : OK
  Learn Cycle Requested                   : Yes
  Learn Cycle Active                      : No
  Learn Cycle Status                      : OK
  Learn Cycle Timeout                     : No
  I2c Errors Detected                     : No
  Battery Pack Missing                    : No
  Battery Replacement required            : No
  Remaining Capacity Low                  : No
  Periodic Learn Required                 : No
  Transparent Learn                       : No
  No space to cache offload               : No
  Pack is about to fail & should be replaced : No
  Cache Offload premium feature required  : No
  Module microcode update required        : No

BBU GasGauge Status: 0x0180
  Relative State of Charge: 93 %
  Charger System State: 1
  Charger System Ctrl: 0
  Charging current: 0 mA
  Absolute state of charge: 83 %
  Max Error: 0 %
  Battery backup charge time : 48 hours +

BBU Capacity Info for Adapter: 0

  Relative State of Charge: 93 %
  Absolute State of charge: 83 %
  Remaining Capacity: 1252 mAh
  Full Charge Capacity: 1351 mAh
  Run time to empty: Battery is not being charged.
  Average time to empty: 2 Hour, 30 Min.
  Estimated Time to full recharge: Battery is not being charged.
  Cycle Count: 28

BBU Design Info for Adapter: 0

  Date of Manufacture: 11/14, 2011
  Design Capacity: 1500 mAh
  Design Voltage: 4100 mV
  Specification Info: 0
  Serial Number: 1232
  Pack Stat Configuration: 0x0000
  Manufacture Name: LS36691
  Firmware Version   :
  Device Name: bq27541
  Device Chemistry: LION
  Battery FRU: N/A
  Transparent Learn = 0
  App Data = 0

BBU Properties for Adapter: 0

  Auto Learn Period: 28 Days
  Next Learn time: Tue Sep 24 18:17:39 2019
  Learn Delay Interval:0 Hours
  Auto-Learn Mode: Enabled
  BBU Mode = 5

Exit Code: 0x00