: Why doesn’t Current or mAh capacity doesn’t increase In series configuration of batteries

Question

First of all I know Voltage goes Up in Series and Capacity/Total Current in Parallel.

But I have confusions,

For example let’s say we have 2 Li-ion cells,
Both 3.7 volts and 2000 mAh or say 2 AH.

When their volts go up to 7.4 volts why doesn’t it go to 4000 mAh as well?
Where does the other 2000 mAh go?

I know because Battery is now delivering current at faster pressure (volts) but it still doesn’t explain why battery is not called 4000 mAh after It’s put in series.

-x-x-x-

In: Physics

Answer 1

> I know because Battery is now delivering current at faster pressure (volts) but it still doesn’t explain why battery is not called 4000 mAh after It’s put in series.  

This is it though.  

Power = Current x Voltage  

Work (energy used) = Power x Time 

So to get the energy you multiply the mAh by the voltage.  

This means two batteries separately delivering 2000mAh at 3.7V is the same energy as one delivering 2000mAh at 7.4V.  

If you were getting 4000mAh at 7.4V you’d need to somehow double the energy in the batteries.  

/mAh is a bit of an odd unit for expressing the energy batteries contain as it’s not a value for energy.