You probably ask this question every time the double A’s Wii remote right when you reach the final level. To get to the bottom of why some batteries earn extra life in a recharging station while others are bound for the recycling bin, you first need to know what a battery is. It’s simply a container filled with special chemicals that generate electricity through a chemical reaction. This reaction starts when you place the battery in your gadget and turn it on, completing a circuit that triggers electricity to flow from the battery’s positive terminal, through the wiring of your gadget, and back to the battery’s negative terminal (these terminals are marked with + and – symbols on your battery).
When all the chemicals in a standard, non-rechargeable battery have under gone the reaction process, the battery is dead. Time to drop it off at a recycling station (usually found in hardware stores). Rechargeable batteries, however, contain different chemicals that can react in the opposite direction, filling with electricity when you place them in a charger. Eventually, the special chemicals wear out and the reaction can no longer be reversed. But until that happens, you can recharge them again and again, giving your batteries more extra lives than you’ll find in any video games.
Picture Credit : Google