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I've always used the following for NiCds:
(1.5) times (battery capacity) divided by (charger capacity) = hours
Assuming the HP-45 charger is 50 ma, then
1.5 x 450 / 50 = 13.5 hours
1.5 x 650 / 50 = 19.5 hours
So, 20 hours should be about right.
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Most of the original HP packs were 600 maH. Some very early ones were 500.
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Joined: Jan 1970
Aha!
Charge them all the way to the end, right from one end to the other. Anything else leads to a big bulge at one end and then it won't fit into the battery compartment.
Wooooooooha!
JasonG...
PS: Sorry for the frivolity...it's just a wild reaction against a very crap week...