HP Forum Archive 19

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BATTERY LONGEVITY Message #1 Posted by Howard Lazerson on 26 July 2009, 11:06 p.m. I use an 11c daily and the batteries last forever [ well at least it seems that way ]. Is that true for the newer 12c?

Re: BATTERY LONGEVITY Message #2 Posted by Don Shepherd on 26 July 2009, 11:18 p.m., in response to message #1 by Howard Lazerson Howard, I can't tell if it will be forever, I only received my ARM-based unit a couple of months ago, but so far so good. I use it every day, mostly running programs on it, and the batteries are fine so far.

Re: BATTERY LONGEVITY Message #3 Posted by DaveJ on 27 July 2009, 4:40 a.m., in response to message #1 by Howard Lazerson Quote: I use an 11c daily and the batteries last forever [ well at least it seems that way ]. Is that true for the newer 12c? No, absolutely not. See HERE and HERE The 20B with the same basic architecture is rated for a battery life of around 9 months, Cyrille has implied the new 12C should be a bit better than this this. That's the general figure HP quote. But it could be as low as a few months if you really used it hard. Technically speaking, if you had a program loop running continuously (Katie gives an example of a "long amortization function"), the batteries would be dead within 20 hours. And that's being generous, that figure does not include various losses. Dave.

Re: BATTERY LONGEVITY Message #4 Posted by Katie Wasserman on 27 July 2009, 11:04 a.m., in response to message #3 by DaveJ To take this a step further.... Even if you never turned on the new 12c(12c+) the batteries would run out in around 12 years based on 220maH capacity is each CR2032 cell. The original 12c with original silver oxide batteries could last a lot longer than that. If you had the 12c+ on but weren't entering numbers or running any functions the batteries would last just about one year. Of course it does have an auto power off function so that this won't happen.

Re: BATTERY LONGEVITY Message #5 Posted by Michael de Estrada on 27 July 2009, 11:41 a.m., in response to message #4 by Katie Wasserman Pretty much my experience with the HP-33s and HP-35s. The original batteries in my HP-15c lasted over 20 years!

Re: BATTERY LONGEVITY Message #6 Posted by Quan on 27 July 2009, 5:12 p.m., in response to message #5 by Michael de Estrada I agree on the 33s (CNA 815xxxxx) which I bought a couple months ago new in box. Batteries had already expired before I turned the calc on. I imagine the 35s which I bought ealier this year will experience the same. Regards, -Quan

Re: BATTERY LONGEVITY Message #7 Posted by hugh steers on 27 July 2009, 6:56 p.m., in response to message #6 by Quan Conceptually, this is what you guys want. I'd buy one! the idea would be better than solar since it would be more capable of retaining a program than a solar model. or maybe it would be to power the LEDs, so that it works in the dark?? :-)

Re: BATTERY LONGEVITY Message #8 Posted by John B. Smitherman on 30 July 2009, 9:56 p.m., in response to message #7 by hugh steers Hi Hugh. I actually prefer Regards, John

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