[Lead Acid batteries]
takes them, as well as a SCM portable word processor.
And wasn't
there an early HP portable PC that also used them?
Yes. The HP110 and 110+ computers (aka 'Portable' and 'Portable Plus')
use a 6V lead-acid battery. 3 2.5Ah Cyclon cells (the ones we've been
discusssiong) fit perfectly, and in fact the 110+ service manual shows
such a battery. But many machines shipped with a Panasonic 'block
battery' -- a cuboidal 6V lead-acid thing.Nowadays it's easier to get the
Cyclon cells.
The HP9114 disk drive (both versions) also uses a 6V lead-acid battery
inside a housing that includes the charger PCB. Again, most units seem to
have come with a 'block battery' but 3 Cyclon cells fit the hosuing too.
And IIRC the HP3421 Data Acquisition unit (an HPIL/HPIB digital
multimeter/relay scanner/etc) uses a lead acid battery. I forget the
exact type, I know I found a common Yuasa one would fit with minor
mechancial changes.
-tony