>   Le 07/10/10 16:25, Matt Rhys-Roberts a =E9crit :
>>    As per subject. Just wondering if anyone's got more clues than I've
>> managed to find so far.
>>
>> Thanks
>> Matt
> It is physics, or electro-chemistry, if you prefer.
> - NiCd delivers 1,2 V
> - NiMH delivers 1,2 V
> - Lead delivers 2 V
> - Li delivers 3,7 V
>
> Other combinations are possible but it is a matter of energy efficiency
> W/liter and W/kg.
> --

Based on more than 100 years of trying, I guess it is difficult to make a
1.5V rechargeable battery. As others point out, there's a lot going on in
battery research. They are getting better in terms of energy, mass, and
volume efficiency. I don't think a whole lot of attention is being given
to the cell voltage though, since it's efficiency everyone is after, and
it's fairly easy to do voltage conversions. I have a hard copy of the 1903
book "Storage Battery Engineering" at home. See
http://tinyurl.com/StorageBatteryEngineering .

Harold



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