If you have your PC case off you will see something on the motherboard that looks like a small thick silver coin. That is the battery. There are other types of battery used on newer machines Ni-Cad NVRAM but these much less frequently found and so I won't discuss lithium stocks copyright them further.
A few years ago mobile phones used Nickel-Cadmium batteries that had a "memory" so to speak. What this means is that if you let you battery get to 50% of charge capacity and then charged it it would start to think that at 50% capacity it was totally empty. Many of us remember how quickly cell phone batteries seemed to die with the (Ni-Cad) battery. If you have a Nickel-Cadmium or a Nickel-Metal Hydride battery, make sure you let it run all the way down before charging to give it the correct memory parameters. Lithium mines Ontario Ion batteries have no "memory effect" whatsoever. This means you can charge your phone when the battery is at 80% or when it is completely dead without harming the battery.
In the past few years, hybrid car sales have taken off. Despite being only 1.5% percentage of the overall car sales market, hybrid car sales are still seeing phenomenal growth (a 28% increase over last year).
This cordless driver comparison showed that Lithium-ion batteries hold a charge a lot longer than a nicad battery. A fully charged Lithium-ion batteries can hold a charge for up to a year. My cordless driver comparison did clarify to me that when comparing drivers its important to compare cordless drivers with similar power. Power wise a 12 volt Nicad battery has the same power as a 12 volt Lithium battery stocks ion battery and a 18 volt nicad battery has the same power as a 18 volt Li-ion battery. So don't expect the same torque found in a 18 volt nicad cordless drver from a new 12 volt li-ion cordless driver.
The NiMH battery is much friendlier to the environment than the NiCd battery. It showed up in the market after the NiCd. The two types of batteries share the same physical packaging so that you can use a NiMH replacement battery for you NiCd cordless tool. NiMH battery can hold more charges and last longer than the NiCd battery so it costs more. But if you can find a NiMH replacement battery, it is a better deal despite the higher price.
Buy a safe mobile phone charger that suits your voltage requirements. You might want to have more than one mobile phone charger, when it is so, buy a reliable and user friendly one.