Camcorder battery
Portable electronic devices such as a laptop computer, a camcorder, a mobile phone and a compact recorder are being quickly developed. Various types of batteries are now used as power sources for portable electronic devices. A digital camcorder is equipped with a rechargeable battery for supplying power. Such a rechargeable battery is made to join or separate from the main body of the camcorder by a coupler. Various types of rechargeable battery packs are known for use with video camcorders. Such battery packs comprise an insulated housing, at least one rechargeable battery permanently encased in the housing, and a structural mechanism for attaching the battery pack to an electronic device in such a manner that electrical energy may be continuously supplied from the battery to the camcorder. The vast majority of such battery packs use either Lithium cells, or nickel-cadmium or nickel-metal hydride cells. A nonaqueous electrolyte battery such as lithium ion secondary battery, i.e. a small-size large-capacity sealed battery. The nonaqueous electrolyte batteries for camcorders and video cameras are generally designed in rectangular shape. The battery packs may be provided with voltage control and protective circuitry for ensuring correct charging and discharging conditions to permit proper operation of the battery in conjunction with the digital camcorder. Battery packs for portable electronic devices are typically known as "smart" or "intelligent" battery packs. A smart battery is equipped with specialized hardware circuitry and software that provide present state, calculated and predicted data to a camcorder under software control. By adding electronic circuitry inside the battery packs, these smart batteries can report, for example, fuel gauge information as well as provide power management information so that the host can make more efficient use of battery energy and prolong battery life. Often digital camcorders give an indication of an amount of charge left in the battery. The charge indicator displays an indication of a percentage of useful power remaining compared to that the full charged battery.
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