Guidelines for replacement of the T2000 SC Battery

Asset ID:	1-79-1498003.1
Update Date:	2017-08-30
Keywords:

Solution Type Predictive Self-Healing Sure

Solution 1498003.1 : Guidelines for replacement of the T2000 SC Battery

Applies to:

Sun SPARC Enterprise T2000 Server - Version All Versions and later
Sun Fire T2000 Server - Version All Versions and later
Information in this document applies to any platform.

Purpose

Provide a customer visible document to explain the T2000 battery life expectancies.

Scope

T2000 battery that resides on the SC maintains the system real time clock (RTC) when the system is powered off.

A workaround deployed to overcome a defect in the ADM1026 battery voltage monitor chip used on T2000 MB disables
voltage monitoring averaging routine, resulting in a much higher polling frequency. Over time, this can result in
the battery draining at a relatively faster rate due to higher than expected current draw from the battery.
Field install base shows a steep failure rate with a Time-to-Failure (TTF) of 4.5 years. Battery replacement at
4 years is recommended to enable battery replacement as routine maintenance activity and avoid taking downtime
explicitly for battery replacement upon failure.

These battery replacement guidelines do not apply for Netra T2000 systems.

Details

Affected Parts:

150-1204 - 3V Lithium battery (CR1225 / BR1225)
Battery PN 150-1204 is used across a wide range of systems. However, high failure rate is only observed for T2000
systems. Recommendation to replace battery every 4 years is only being issued for T2000 systems.

Resolution

T2000 battery should be replaced every 4 years in the field.

Identification of Affected Parts (how to):
The first four digits of a System Serial Number are the date code, e.g.; for system Serial Number '0651NNN1XA' the
digits which constitute the date code are 0651.

Once the date code, embedded in System Serial Number, is identified use the below table to determine if the battery
should be replaced.

Determine Current      Replace Batteries in Systems with Serial Number
Calendar Quarter        Date Codes less than or equal to:

   2011Q4                      0739
   2012Q1                      0752
   2012Q2                      0813
   2012Q3                      0826
   2012Q4                      0839
   2013Q1                      0852
   2013Q2                      0913
   2013Q3                      0926
   2013Q4                      0939
   2014Q1                      0952
   2014Q2                      1013
   2014Q3                      1026
   2014Q4                      1039

After initial battery replacement, records should be kept to determine when the battery replacement is needed next
after 4 years, if the system is still in operation.

Comments

This issue was fully evaluated and determined not to meet FCO criteria as the issue is not related to a product defect.
The intent of this knowledge article is to provide guidelines to enable battery replacement for T2000 systems to be done
as planned, routine maintenance activity given it is a cold-swappable component.

Netra T2000 systems are not experiencing high battery failure rate with 4.5 yr TTF as seen on Commercial T2000 systems.
Hence these battery replacement guidelines do not apply for Netra T2000 systems.

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