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PPPP Error on E30 OBC

Well, I decided to change the battery on my sister's 87 325is to prepare for the
winter season (the battery was over 4 years old).  After doing so and resetting
the date and time on the OBC, I noticed that in every mode (av mpg, timer, av
mph...), the OBC would display PPPP and no numbers.  For example, average mph
would display PPPPmpg.  Has anybody else had this problem?  If so, maybe you
could point me in the right direction in fixing it.  My guess is that the
ni-cads need to be changed, but I'm not sure.   Suggestions?

Thanks!

Dan Lai