Byron Jeff wrote:
>
>> And let's say I put two of these in series to form a 3 V battery. Will I
>> have a 3 V battery with 1500 mWh?
>>     
>
> No. You'd have a 3V battery with 500 mAh 1500 mWh/3V = 500 mAh.
>   

Emmm.... right let me try this again.

* I've got two batteries
* They're both 1.5 V
* They're both 500 mAh

Now, if the voltage is 1.5 V, then 500 mAh corresponds to 750 mWh.

One battery = 750 mWh of energy
Therefore two batteries = 1.5 Wh of energy

Ok so altogether I have 1.5 Wh of energy in these two batteries.

Now I put them in series and hide them in a sealed black box and tell 
everyone that it's a 3 V battery.

OK so now I've got a 3 V battery and I've got 1.5 Wh of energy 
altogether. That right?

Now, to go back from Wh to Ah, I divide by the voltage

    1.5 Wh  /  3 V   =  500 mAh

OK, so I've got a 3 V battery with a capacity of 500 mAh. That right?

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