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Knoledge about battery

Ni-Cd and Ni-MH:
The main difference between the two is that Ni-MH battery (the newer technology of the two) offers higher energy density than Ni-Cds. In other words, the capacity of a Ni-MH is approximately twice the capacity of its Ni-Cd counterpart. What this means for you is increased run-time from the battery with no additional bulk or weight. Ni-MH also offers another major advantage: Ni-Cd batteries tend to suffer from what is called the "memory effect". Ni-MH batteries are less prone to this problem and thus require less maintenance and conditioning. Ni-MH batteries are also more environmentally friendly than Ni-Cd batteries since they do not contain heavy metals (which present serious landfill problems). Note: Not all devices can accept both Ni-Cd and Ni-MH batteries.

Lithium Ion
Lithium-Ion (Li-ion) has become the new standard for portable power in consumer devices. Li-ion battery produces the same energy as Ni-MH battery but weighs approximately 20%-35% less. This can make a noticeable difference in devices such as cellular phones, camcorders or notebook computers where the battery makes up a significant portion of the total weight. Another reason Li-ion batteries have become so popular is that they do not suffer from the "memory effect" at all. They are also environmentally friendly because they don't contain toxic materials such as Cadmium or Mercury.

What is the difference between Ni-Cd, Ni-MH and Lithium Ion batteries?
Batteries in portable consumer devices such as a laptop, camcorder, and cellular phone, etc., are typically made using either Nickel Cadmium (Ni-Cd), Nickel Metal Hydride (Ni-MH) or Lithium Ion (Li-ion) battery cell chemistry. Each type of rechargeable battery chemistry has its own unique characteristics:

battery Tips:

1. New battery pack must be fully charged before use.
2. New battery pack needs to be fully charged and discharged (cycled) a few times before it can condition to full capacity.
3. Rechargeable batteries undergo self-discharging when left unused. Always store a battery pack in a fully charged staged for storage.
4. Fully drain and fully recharged your battery pack every few months.
5. Turn down the LCD brightness of your portable device.
6. Use built-in power management on your portable device.
7. more info...