A while back someone was asking about what the battery in the HP
9826/9836 was for. I replied that it was used for a RT clock and that if
could also be used for shutting down the computer gracefully in the event
of an AC power loss. Well, I finally found my manual for it. It's option #
050 and PN 98270 (cost $1515 in 1983). Now that I have the manual in hand I
can give you exact answers to any questions about it. (FWIW I just picked
up an 9826 that has this option in it this past weekend.)
Joe