How Do Some Batteries Recharge themselves?

With the huge rise in portable info-media devices such as laptops, cell phones, MP3 players and cordless power tools, the need for NiCad rechargeable batteries has grown impressively in last few years. The concept of the rechargeable battery has been around since 1859, when French physicist Gaston Plante invented the lead acid cell, which would later become the world's first ever rechargeable battery. That same chemistry is still used in today's car battery.
The basic premise behind the rechargeable battery is simple: when electrical energy is applied to the battery, the electron flow from negative to positive that occurs during discharge is reversed and power is restored. This requires an adapter in the case of devices with built-in batteries or for standard nickel-cadmium or nickel-metal hydride batteries, the most common multiple use rechargeable batteries used today in your remote control, flashlight or power drill.
Car batteries are one of the oldest kinds of rechargeable batteries and in fact, the electric car predates its gas-powered cousin. In a standard car, there is a single lead-acid SLI battery that supplies power to the starter, lights and ignition system. The battery charger in this case is the alternator, a clever device that converts gasoline power to electrical energy and distributes it where needed. In electric and hybrid cars, traction batteries are used to power the vehicle down the road. Traction batteries come in many varieties, from lead acid, to nickel-cadmium, nickel metal hydride and lithium ion.
The recharging rate has improved substantially over the years and can take between 1 and 15 hours.
The rate of charge is determined by how much electrical current is allowed into the battery by the charger. Some batteries can handle higher voltage in a shorter amount of time without overheating, while others need a lesser voltage applied over a longer period of time. The quicker the rate of charge, the more chance there is of over charging, which can ruin a battery's chance of holding its charge. The key in avoiding an over charge is the ability to dissipate the charging current once maximum power has been reached. Nearly all chargers have built-in voltage regulators do this, allowing you to safely leave your cell phone or computer plugged in overnight.

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