Re: How much current does a flashlight battery offer?

From: Watson A.Name - \ (NOSPAM_at_dslextreme.com)
Date: 09/06/04 

Date: Mon, 6 Sep 2004 07:17:17 -0700

"The Phantom" <phantom@aol.com> wrote in message
news:8sohj0tm3mkap2hs832rbohnenlthe1nm7@4ax.com...
> On 2 Sep 2004 02:28:01 -0700, wylbur37nospam@yahoo.com (wylbur37)
> wrote:
>
> >For the typical flashlight battery (AAA, AA, C, D),
> >all of them are 1.5 volts, but how much current do they offer?
> >(I'm guessing it's around 100 to 150mA, and it varies according
> >to the type of load that's on it).
> >
> >And does it differ according to the battery size?
> >(does a "D" cell offer more current than an "AA"?)
> >or is it just that the D lasts longer?
>
> Go have a look here for the alkaline type cells:
> http://data.energizer.com/datasheets/contents/alkconsumeroem.htm
>
> and here for the NiMH cells:
> http://data.energizer.com/datasheets/contents/nimh.htm
>
> It's interesting to note that the internal resistance of the D
> alkaline (173 milliohms) is larger than than that of the AA cells (146
> milliohms).
>
> It's also interesting to note that the volume of a D cell is 6.9 times
> that of an AA cell, and the capacity of an alkaline D is 6.3 times
> that of an alkaline AA (numbers taken from the Energizer site).
>
> But the capacity of a NiMH D cell is only 3.7 times that of a NiMH AA
> cell (calculated using 8500 mah for D cells, and 2300 mah for AA
> cells, currently near the state of the art).
>
> It looks like the battery folks have been really working hard to
> squeeze more into the NiMH AA cells.

Baloney! They're putting _less_ into the D cells! The D Ni-MH cells
that I've seen are just AA cells inside D sized shells.

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