Posts: 2,448
Threads: 90
Joined: Jul 2005
357. Y ou will need three of them. But not a 357 magnum--that's a bullet:-)
The 357 is silver oxide. You can also use an LR-44 alkaline pile. The latter is not much cheaper, but lasts no where near as long as the silveroxide. However the downside of the 357 (siver oxide) is that when it does start to lose juice, it happens much faster and more suddenly than with the alkaline. If you have a lot of programs loaded, and you want to be able to ignore the low battery indicator for 15 more minutes, tehn better to get the LR-44.
BTW where did you buy your 27s? Are you the original owner? Is this the first battery change? If you are the original owner, would you mind telling your "story"? the 27s, being an Algebraic hp, we would love to know how the original buyers came to choose it. Most HP people are RPN addicts--your take on the world is apt to be insightful....
Regards,
Bill
Edited: 7 Mar 2006, 4:39 p.m.
Posts: 1,792
Threads: 62
Joined: Jan 2005
Christine --
As Bill mentioned, the 357- and 44-series 1.5V button cells will work for the HP-27S. I'll note that there are four types of cells that are compatible for all Pioneer and Voyager series calc's (except late 12C's and the 12C Platinum): 13, 44, 76, and 357.
I don't know the reason for the proliferation of identifiers for interchangable cells. I also don't know if there is any difference in the specifications. It would seem as though some consolidation would be in order.
-- KS