Jinx wrote:
> Batteries in series add voltage, batteries in parallel add capacity

OK so let's say a particular AA battery is 500 mAh. Because it's 1.5 V, 
that means it's 750 mWh, which is 208 mJ.

If I have two of these batteries, then surely I have twice the energy? 
i.e. 1500 mWh   or   416 mJ.

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?

It seems to me that regardless of whether I put two batteries in series 
or in parallel, the energy will always be the sum of the two batteries' 
energies. Therefore:

Two AA batteries in series:  3 V  and  1500 mWh

Two AA batteries in parallel:  1.5 V and 1500 mWh

That right?

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