disk cache battery story

I had to replace the battery on the disk controller of my 170 today. 
After the battery died on thursday I did a bunch of compiles to
measure how slow the system had gotten. Compiles were taking 20
seconds each.

Part number 91H3968. $75!!

It was easy to replace the battery pack. Pull the card from the PCI
slot on the 170. ( is that the PowerPC CPU on that same card?  It has
powerPC printed on it, but does not appear very big. ).  Upen the cage
the battery is in, snap in the new battery, put the card back in its
slot.

Funny thing is after IPLing the system the error message was gone from
qsysopr but my compiles were still taking 20 seconds each.  Did about
20 compiles and they were all slow. Now I am back on the system 30
minutes later and the compiles are running fast again. About 4 seconds
each.   For a reason I cant explain, the system took a little while
for the disk cache memory to start working.

-Steve