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I going to try to illustrate with an analogy. Let's say that we a bunch of rulers all different sizes but all of them divided into 10 parts. There are tall ones and short ones and some of them average size. Let us say we grab 6 of them and we end up with a couple of short, a couple of medium and a couple of tall ones. Again each one of them is divided in 10 equal parts.
Let us say that we put them all standing up inside a room but they give us two options. We can either hang them from the ceiling or we can put them standing on the floor.
Let us add some little monkeys that climb up and down the rulers. We'll call the little monkeys "Electrons Monkeys".
When top the rulers of from the ceiling we realize that some that some Electron Monkeys fall of the ruler and are not able to climb back up.
On the contrary situation when we stand the rulers on the floor and they are all even on the floor (bottom balancing) we see that the Electron Monkeys not only are able to go up and down with no problems but also in case they jump of the top of the ruler they land back up to it.
Now let us go back to mother earth and talk about LiPoFe's. Each individual cell has their own rate of discharge. They chemical things so the physical condition for them is unique to each cell. When make sure that all the cells in a pack are discharged to the same bottom voltage (the floor standing rulers) at 2.7v we know that none are going to drop off (Electron Monkey falling of the ruler).
When we charge the whole pack each cell is going to have their own rate of charge, which is pretty much the same rate of discharge. So since we know the bottom is 2.7 volts on all the cells we know that they will all reach that voltage at about the same time ergo preventing any cell from going below before the others.
...and they lived happily ever after for around 8 or 10 years until a new technology replaced those cells with new ones called Laser Monkeys!
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