HP27S battery?



#2

I'm trying to find the type of battery for my HP27s-can anyone help me out?
Thanks,
Christine


#3

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.


#4

I'm the original owner. I bought it when I was an undergrad studying for my EE degree. I had it in storage with no batteries, so I wasn't sure what to replace them with. Thanks for the info! I am sure I have the owner's manual somewhere, but I figured the info might be faster to find on this forum.

Sounds like there are a lot of die-hard 27s fans out there!

#5

You also asked how I chose the 27s. It has been awhile, but I chose it due to the recommendation of another EE student and its programming ability. At this point, I never need much more than basic functionality though.


#6

Hi Christine,

Thanks for your reply. It is very interesting to here that the 27S had a following not only among engineers, but specifically among EE's.

Best regards,

Bill

#7

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


#8

Hi, Karl:

Karl posted:

"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."

    It has to do with different brand names and the specifications are
    the same. For instance you have:

    Reference 357 = IEC SR44 = Energizer BSR44H = Japanese SR44W = Varta 541

    where Japanese means Panasonic, Sony, Maxel, Toshiba, ... all of them being 1.55 V high drain silver oxide cells, with diameter = 11.6, and height = 5.4.

Best regards from V.


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