On Sat, 2005-12-31 at 21:20 +0200, Peter wrote:
> 
> On Sat, 31 Dec 2005, Russell McMahon wrote:
> 
> >> Unfortunately things have gotten much worse.
> >
> >> For example: at my local home depot they sell name brand NiMH
> >> rechargeable batteries (right now I don't remember which, but it is one
> >> of the big two). The AAs have a capacity of 2200mAh. Guess how much
> >> capacity the D cells have? Yup, 2200mAh!??!
> > ...
> >
> >> At least they're truthful about the capacity, but IMHO that's just
> >> slimey. Those "D" cells are MUCH more expensive then the AA cells, yet
> >> the have the same capacity. People buying those batteries as a
> >> replacement for alkaline D cells must really get ticked off to realize
> >> they last probably 1/3 as long.
> >
> > A good modern Alkaline true D cell typically has > 15 AH capacity, or just 
> > under 7 times the AA cell's 2.2 AH capacity.
> 
> Doesn't capacity scale with weight, and volume (and with the square of 
> the diameter for cylindrical cells) ? How about price scaling ? How much 
> for a 'real' D cell vs a 'real' AA ? 7 times more ? Probably not.

Well capacity isn't the only cost. Aside from actual capacity the
packaging of the cell and the marketing doesn't really change whether
it's an AA cell or a D cell. 

There's also the volume factor. AAA cells are about twice as much as an
AA cell, despite being much smaller and lighter.

TTYL

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