Technichally how does a rechargeable battery loses its energy fast when it becomes old?

Question

Especially Rechargeable battries in cell-phones

Answer 1

Batteries work due to the separated ions migrating to the opposite poles to carry the charge. This allows the electricity to move from one pole of the battery through the phone (or other device) and back to the battery. Eventually enough of the charged ions have move and changed place that there are not enough of the ions remaining to carry enough of a charge for the battery to work.

When batteries are recharged we use electricity to force the ions to move back to their original separated positions. Then we can use the battery until the ions move and not enough remain to carry the charge. We need to recharge the battery again.

It is not natural for ions to move back to the separated position. It goes against the natural tendency of materials to become less organized. When we recharge batteries some ions will resist moving back.

Let's say that 5% of the ions refuse to move back when the battery is recharged. After several times of recharging, if 5% refuse to move back each time you can see that eventually you will have significantly fewer ions returning to the separated position with each charge. That means there will be fewer ions to move and carry the charge so the battery runs down faster.

Answer 2

Batteries work by oxydoreduction of electrolytes. The reaction is meant to be reversible, but there is a mounting and progressive degradation of some components. A car battery, for instance, has lead oxidizing and getting into solution and lead reducing and depositing on plates. But the lead will not always deposit evenly, causing variations and degradation in the performance of a battery over a number of charge/discharge cycles.
An old battery does not have as much charge capacity as a new one.

Answer 3

that's totally right, i hate this thing...but we got this in science and it's because in the battery there are two opposite sides..yes even in the rechargable one..anyway the sides are made from different materials that makes an electrical circuit...when you recharge a battery the plug electricity makes both sides neatly charged like this (+ - ) and that means the movement of electrical charges where they belong...and so here comes the answer when a battery is used a lot both sides's power known as the voltage decreases over time because the sides' materials simply loses their charges and that means the sides neutrailes each other.....fewwwhhh.. i've never explained anything in science but this..... oh my god...i can't believe i know this..... i won't fail science...ooo ops...sorry i'll snap out of it away from you...hope i helped.