I just had to add this (it's about high-capacity batteries, so very relevant to this thread):

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When you are on business or having a trip with a splendid mood, your portable computer is absolute a indispensable assistant for you. However, because of the limited using time and high price of the built-in battery, you may be done harm to by that, of course , you are very boring.

Can the problem be solve? The answer is definite YES. Our shop focus on all kinds of tailor made notebook computer piles such as 7.2V, 10.3V, 12V, 15V, 16V, 17.5V, 18V, 18.5V, 19V, 19.5V, 20V,21V, 22V, 24V, etc. which the current capacity from 1800mAh---to 9000mAh even more, and output current high to 6A. each pile built-in charge/discharge protective circuit and shortcircuit protective circuit, that ehances the battery’s working period.

The new development lithium pile built-in high-efficient low temperature high power voltage transformer similar table computer’s main board’s, the offset of output voltage is below 0.5V during long time working with no any extra comsumer. The redundancy protective circuit design enable output more stable. Built-in SONY, PANASONIC or SANYO spare enable stable and long-time voltage output. This is our ensure to the consumer with high satification. And we offer charger and saving energy software and power supply interface.

On the other hand, lithium battery is much safety than AC/DC switch and light 35% than nickel-hydrogen battery.

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A 'memento mori' for any of us who pride ourselves on speaking 2 or more human languages.