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I just saw this auction (no. 271338319216) and noticed in the description it says "this item can't be used with the battery, but only with a transformer".
But... wasn't the 67 one of those calculators which could be fried if used with a transformer without batteries installed??

(btw, I'm in no way connected with the seller).

Maybe the seller wanted to say that you can't ues regular batteries, since you need a special rechargeable battery.
However it could also mean that the battery is dead.

Probably the battery contacts are broken/corroded...

Yes, when looking at the other HP auctions of that seller it seems to be the most likely reason;-)