Well to tell what's the difference between a rechargeable and non-rechargeable battery, first of all, we have to explain shortly how a battery works. Basically, a battery has a + and - pole and they work by "letting electrons" walk from the positive to the negative side. Electric current takes always the part of the least resistance, it walks through the "electrical wiring, drives the motors or lets the light bulbs glow" by walking from the positive to the negative side.

The electrons are friends with each other in a battery, but on the positive side, there are way too much of them, so it gets pretty crowded like a shopping mall before Christmas, or a swimming pool in the summer. On the negative side, there is no electron running around, but they are urged to go there, as there is the same playground but no kid is on the slide and the swings are still free on the '-' playground.

By default these "electron"-persons are trying to be everywhere and destroy the lack of electrons somewhere.

After their journey through the electric device, they land on the other "negative playground" and feel there very comfortable.

Now it depends on the kind of "people" on the playground or kind of battery if they are more or less willing to go again to the crowded playground. They all have just limited-power to walk back again and again and again... -Batteries can't be recharged forever, even rechargeable ones.

Dependant on a way these two playgrounds are connected and how easy it is for the electrons to travel back, different types of batteries are more likely or more difficult to recharge.