>Hi, Gods oracle.


None of them here :-)

>I have to use a rechargeable battery, capable of supplying 100 mA for 3 to
4
>hours. Can be charged slowly, no problem.
>The real, real, real, issue is COST !
>AAA size would be perfect.


More information needed.
You want 4 x 100 = 400 mAH but didn't tell us the very important voltage you
require.

A single NiCd (Nickel Cadmium) AAA cell has about 200 mAH to maybe 400 mAH
capacity in an advanced version so it's too possibly adequate, if you can
tolerate the 1.2 intitial to under 1 volt final terminal voltage. For a
higher voltage you will need a number of them (one for about every volt of
final required terminal voltage). eg if this is for a 3 volt minimum system
you will need 3 or 4 cells NiCd,

NiMH is not much different in energy capacity - maybe up to around 600 mAH
(maybe more in the very latest versions?).

An alternative is to use a single larger size cell and an inverter to
convert this to your desired output voltage.

Other battery chemistries are available with higher energy densities but
they cost more per capacity (eg Lithium Ion).

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