There is hardly any difference in how a laptop battery works and work like any other device batteries. The batteries that power your portable CD players, radios, video cameras, etc. are more or less the same except that a laptop battery is more intelligent if you can call it that. Just like the rest of the battery laptop batteries in different shapes and sizes with the addition of a complex electronic circuit are used in connection with the laptop Hardware. This electronic circuitry manages the power that is not in the battery during charging and the power from the currents of each cell of the battery while, take a feature that is included in the normal batteries for other household appliances.