iPod Nano 3G Battery Extended External Power Pack 1000mah

Code:	iphone3gpowerstation-dw
Availability:	Usually ships the same business day.
In Store Price:	$45.95
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iPhone 3G Battery Pack External Lithium Ion 1000mah Battery

Lithium ion battery specifications.
External Battery Power Plant for Apple iPhone 3G and iPhone 3G products.

A cell of a lithium-ion battery consists of a carbon-based negative electrode and a lithium transition metal oxide positive electrode. Upon charging, lithium ions are extracted from the positive electrode material and inserted into the negative electrode material. Upon discharging, the reverse process is taking place.

As long as the charge and discharge currents and battery temperature are controlled, Li-ion batteries are safe. Overcharging can convert the lithium oxide to metallic lithium, though, with the associated danger of explosion. Because of this sensitivity to charging conditions, notebook manufacturers use 'intelligent' batteries to power their products. These incorporate simple sensors and electronics to monitor cell voltage, temperature and charge or discharge current.

Intelligent charging systems protect the battery from harmful or potentially dangerous conditions, either by temporary shutdown, which can be reset by removing and then re-installing the battery, or by a permanent 'fuse' that renders the battery useless. Most manufacturers warn against operation at temperatures in excess of 60°C. Usually, intelligent batteries can only be charged while they're installed in the notebook they're ed to drive. Charging them in any other way can cause temporary battery shutdown or long-term failure.

Li-ion batteries should be stored charged. If they're stored for over three months with a cell voltage of less than 2.5V, unrecoverable capacity loss will occur. Also, leakage and degradation are more likely. Some Li-ion battery packs won't allow a recharge if individual cell voltages fall below 2.5V, because at this point cells will have chemically altered and recharging could be hazardous. It's best to store Li-ion batteries charged at between 70 and 90 per cent of full capacity.

All rechargeable batteries suffer from self-discharge when stored or not in use. Li-ion batteries self-discharge by three to five per cent in the first 30 days of storage, then settle down to one to two per cent per month. With intelligent batteries, the control circuits packaged with the battery can consume as much as three per cent of the charge per month. This means that a 90 per cent charged Li-ion intelligent battery can be stored for around 18 months before falling below the minimum charge limit. Shorting out, piercing, crushing, applying a reverse current or heating a Li-ion battery can lead to very high case temperatures or even battery explosion.

Lithium-ion (Li-ion) Batteries

What is a Lithium-ion Battery?
It's a high energy density, 3.6V or 3.7V battery that is widely used in the portable equipment market. It uses lithium metallic oxide in its positive electrode (cathode) and carbon material in its negative electrode (anode), and the lithium ions inside the battery transfer between the positive electrode and the negative electrode during charge or discharge.

Features
High voltage of 3.6V 3.7V lets you cut down on the number of batteries you use. High energy density minimizes battery size and weight, making it perfect for use in small portable equipment. No metallic lithium is used so charging and discharging are very safe. No memory accumulation so it provides a full charge every time. The outer casing in square type batteries is an aluminum alloy, so overall battery weight is lower.

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