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Promoted item:12000mAh Double USB Portable External Battery Power Bank Charger For Cell Phone

12000mAh Double USB Portable External Battery Power Bank Charger For Cell Phone

    • 1802 watching
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    • 2654 sold
  • Condition
  • New
  • Time left
  • 26d 4h 37m
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  • FREE
  • Brand
  • Unbranded/Generic
  • Sold by
  • 99.3% Positive Feedback
    The item is listed as a Top Rated Plus item
  • US $18.99
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  • Quantity 10+Available
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Fast shipping! brand new! (bonus i5 screen protector!)
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USB External Battery For Mobile,Warranty,USA seller
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4 FREE GIFT VALUE $10 patented case New IOS7 updated !
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About Battery

A battery is a storage device for electricity. It is basically composed of two conductors embedded in a chemical solution, with a certain potential difference maintained between them. The battery works when these two terminals are connected, closing the circuit, and permitting current to flow. Thus, chemical energy is converted into electrical energy. The capacity of a battery is measured in Ampere Hours. Even when not used, batteries have a tendency to lose around a quarter of their charge every year. Batteries are normally of two types: disposable and rechargeable. Disposable batteries, also called primary batteries, can be used only once, most often in portable devices. Zinc carbon batteries are cheaper and suitable for lighter applications. Zinc chloride batteries have a longer life. Alkaline batteries have versatile applications, both energy draining and conserving. Mercury batteries are used in digital watches. Silver oxide and zinc-air batteries are used in hearing aids. Lithium batteries are seen in digital cameras, computer clocks, and even watches. Thermal batteries have a high temperature capacity and are used in military applications. Rechargeable batteries are called secondary batteries. Lead acid batteries are used in vehicles, alarm systems, and uninterrupted power systems. Lithium ion batteries are used in mobile phones, laptops, and MP3 players. Nickel Cadmium batteries have a long life cycle. Battery sizes are AA, AAA, or AAAA. An AA battery is 51 mm long and 15 mm in diameter, weighing 23 grams. An AAA battery is 44.5 mm long and 10.5 mm in diameter, weighing 11.5 grams. An AAAA battery is 42.5 mm long and 8.3 mm in diameter, weighing around 6.5 grams.