Battery Voltage reported @ 0.00v by T5120/T5220 & Netra T5220 when battery tests result in proper voltage reading (2.70v or above) (Doc ID 1546856.1)

Last updated on OCTOBER 12, 2016

Applies to:

Sun SPARC Enterprise T5120 Server - Version All Versions to All Versions [Release All Releases]
Sun SPARC Enterprise T5220 Server - Version All Versions to All Versions [Release All Releases]
Sun Netra T5220 Server - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.
There have been reports in the field where T5120 and T5220 machines are reporting 0.00v battery voltages. However, when the batteries themselves are tested with Ohm/Voltage meters, they test positive as holding a charge. Though some conclusions lead to a possible voltage sensor issue, an issue exists where battery terminals are moved or damaged during battery replacements cause lack of connection to both sides of the coin battery. As long as the terminals are not severed or broken off, they may be bent back to original position, thus avoiding a need of a complete mother board replacement.

Symptoms

Machine is reporting battery voltage as 0.00v in sc> showenvironment output:

--------------------------------------------------------------------------------
Voltage sensors (in Volts):
--------------------------------------------------------------------------------
Sensor Status Voltage LowSoft LowWarn HighWarn HighSoft
--------------------------------------------------------------------------------
~snip~
/SYS/MB/V_VBAT WARNING 0.00 -- 2.69 -- --


This is also being reported at the OS level via # prtdiag -v:

Voltage sensors:
------------------------------------------------------------
Location Sensor Status
------------------------------------------------------------
SYS/MB V_VBAT warning (0volts )


However, when the battery itself is tested with an OHM/Voltage meter, the battery shows ~3.00 Volts.

Cause

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