Hi Gus,

I don't know what "primary NiMH" is. As far as I know, alkaline
batteries (especially the enhanced capacity ones like the Duracell
Ultra) have considerably greater capacity than any common rechargeable
battery. Of course, if you are considering the "total cost of
ownership" and willing to recharge you batteries many times, and do
not care too much about the run time per charge, then NiMH would be
superior to alkaline.

I think that the AA "LiON" batteries you saw were probably not Lithium
Ion but Lithium Iron Disulfide (see
http://en.wikipedia.org/wiki/Lithium_battery ). These are 1.5 to 1.6V
nominal, are not rechargeable, and have much greater capacity than
alkaline batteries - along with a higher cost.

I would recommend making a spreadsheet using data from the Duracell
and Energizer web sites, as well as price info from various retailers,
to compare the cost per energy of alkaline normal, alkaline
enhanced/ultra, lithium primary, and NiMH types. For the NiMH types,
amortize the cost of the battery over the cycle life (about 300 cycles
ideally, perhaps more like 100 cycles in typical consumer use) and add
in the cost of the charger amortized over perhaps 3 sets of batteries
worth of cycles.

Sean




On Fri, Oct 30, 2009 at 2:23 PM, NOPE9 <yes@nope9.com> wrote:
>
>
> When considering 9V , AA and AAA batteries .... does one get the best
> bang for the buck with .......
> primary alkaline
> primary NiMh
> secondary NiMh
>
> I have seen AA LION batteries advertised. =A0How is this possible? =A0I
> thought LION was 3.6V.
>
> If one wants to keep all the battery powered toys going , what is the
> best choice now ?
> Are cheap batteries from China going to be a safety issue ?
>
> Gus
>
>
>
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