FWIW.  
Probably not recommended practice but.............
I had a cache battery go out that was less than a year old or so it seemed. 
Brought down the system, removed battery for 2 minutes, put it back in and it's running fine. 
Not totally convinced these batteries need replacement every year :-)
Did you do a WRKDSKSTS 
Regards,
Richard Schoen
RJS Software Systems Inc.
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------------------------------
message: 6
date: Tue, 04 Feb 2014 09:35:05 -0600
from: Joe Pluta <lists@xxxxxxxxxxxxxxxxx>
subject: 5722 SRC27638008 - Battery Pack, right?
I got the dreaded critical system hardware problem notification. I'm 
pretty sure this is a battery pack.  Before I knock the machine down and 
head over to Batteries Plus, if anyone can confirm that'd be great.
It DOES say battery cache as one of the probable causes, I just wanted 
to double check.
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