From budget laptops to ultra-tiny netbooks, ultraportables and high performance, we explain the tricks to finding out the ultimate laptop at the right price.

Battery Extender claims to offer 30 per cent boost.

Its longlife 24-hour battery makes it significantly less portable, but this laptop is classy in every sense of the word.

Wondering which netbooks have the best battery life? We've pulled together a big chart showing how 25 different models compare

If you want a longer lasting battery, you'll have to cough up. We've learnt that the cost of upgrading from the standard 3-cell to 6-cell battery option will cost an extra $169 on the HP Mini 2140.

If you're in the market for a new laptop, one of the most important, and tricky considerations is battery life. We've bench tested 10 ultimate laptops in our latest issue, and here are the results

We tested the battery life of twelve of the latest smartphones, including the iPhone 3G, Blackberry Bold, Nokia E71 and two HTC models.

Research institution MIT are well on their way to developing one of the world's most sought after electric vehicles: a car with 320km range, 161 km/h top speed and a rapid recharge system that takes just 10 minutes to charge.

Impressive and free antivirus and antispyware package

Since we saw the HP Mini for our huge netbook roundup in October, a new 6-cell battery has been released.

Long-lasting battery, enough power to go, and a lightweight design: this has it all in a small package

In an apparent attack of the bleeding-obvious, an AMD rep has come clean and admitted (on behalf of the industry) that notebook and phone battery life figures are completely unreliable.

With electric cars destined to cost significantly more than regular vehicles, electric bikes and motorcycles may provide the world's best short term answer to weening ourselves off oil

It's not widely available, but with this battery life on offer the BenQ Joybook Lite U101 should be

More than just a new coat of paint, the new Wind adds mobility with 3G. While the design and features don't look as cutting edge as they once did, this is still a great netbook

Stunning design goes hand in hand with fine usability, but the non-replaceable battery and high price count against the Eee PC 1008HA Seashell

A striking laptop that’s incredibly portable and has good battery life. But the screen is a big disappointment

We rarely recommend 17in notebooks to friends, because they’re too clunky and expensive. Apple has solved half the problem.

Asus add yet another netbook to their range: the swivel hinged T91 Eee PC and HP offer the Mini 5101 netbook for professionals. We investigate the perfect netbook for busy professionals