Power 832 "Low Battery" Error

["Impalpable" <spdb66@xxxxxxxxxx>]

I have a power 832 system that I worked on a eight months ago.  The
system worked fine for 3 months then gave a low battery error
continuously.  I changed the battery thinking the battery might have
gone bad (old battery).  That didn't solve the problem.  I had heard
of the bridge going bad on 832's and giving that error falsely.  I
had them order a new board and I replaced it yesterday.  The error went
away. Today I checked in to make sure everything was good and the
trouble light was on again.  I checked it and sure enough it said
"Low Battery".  I have tried two batteries and two boards now.  The
non-profit that I am helping with this can't really afford to keep
buying parts.  Anyone know what might be causing this mess?  Thanks.