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.
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In: Physics
You’re discharging both batteries when you draw current at 7.4V. Let’s say you attach a 3.7 ohm resistor, that’ll draw 2A of current, and “drain” your battery in an hour. If you had just the single 3.7V cell, that would have drawn 1A of current, and “drained” it in 2 hours. Because the increased voltage will “push” more current, you’ll drain the capacity sooner, but the total Ah you get is the same. Both cells are involved in “pushing” the extra current.
Look at it from the perspective of the load – adding cells in parallel doesn’t change the pressure, as you say, but it linearly extends how long you can receive the pressure for. Adding cells in series doesn’t change the duration, but for the same load, the higher voltage linearly increases the current you can draw for the same duration.
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