#1 Netbook: Dell Inspiron Mini 1012 (SD)
This retail version of Dell's Mini 10 Netbook, called the iM1012-687OBK, has a great battery, but chances are it's sitting on a shelf right next to a less expensive Netbook with a bigger hard drive.
Battery life: 459 minutes
#2 Netbook: MSI Wind U160
The basic-as-it-gets MSI Wind U160-007US is a leader in battery life, but shouldn't cost $80 more than comparable systems.
Battery life: 438 minutes
#3 Netbook: Acer Aspire One 532h-2326
The Acer Aspire One 532h-2326 is just as good for basic tasks as Netbooks costing $100 more, making it a solid sub-$300 option.
Battery life: 429 minutes
Notable Ultraportable: Lenovo ThinkPad X201
Anyone looking for the power of a midsize laptop in a compact 12-inch body has only a few choices, and none to date tops Lenovo's excellent ThinkPad X201.
Battery life: 412 minutes
#1 13-incher: Apple MacBook, Spring 2010
Apple slightly revamps its basic MacBook with improvements under the hood, but keeps the design and price the same, which makes the new MacBook tough to beat as a back-to-school laptop.
Battery life: 387 minutes
#2 13-incher: Apple MacBook Pro 13-inch, Spring 2010
The new 13-inch MacBook Pro uses a faster version of last year's processor, but a graphics chip upgrade and better battery life give it more value for the same price.
Battery life: 360 minutes
#3 13-incher: Toshiba Satellite T135D-S1324
Toshiba's lightweight and affordable thin-and-light T135 series shaves another hundred off its price by switching to an AMD Neo processor in the T135D-S1324, while offering only slightly diminished performance.
Battery life: 359 minutes
#1 midsize: Apple MacBook Pro 15-inch, Spring 2010
Apple's 15-inch MacBook Pro keeps the same look and feel, but offers major internal changes, including an optional Intel Core i7 CPU, making it a very serious portable powerhouse.
Battery life: 356 minutes
#2 midsize: Gateway EC5809u
As a thin 15-inch laptop packing a lower-voltage Core 2 Duo processor, the Gateway EC5809u sacrifices performance for battery life at a decent price--but you could do even better.
Battery life: 343 minutes
#3 midsize: HP Pavilion dv4-2165dx
The excellent-performing HP Pavilion dv4-2165dx has a long battery life for the money, but it'll cost you some portability.
Battery life: 334 minutes
#1 desktop replacement: Toshiba Satellite A505-S6025
While the Toshiba Satellite A505-6025 has a rock-solid combination of computing power, graphics, and battery life, its price and bulk may be hard to swallow.
Battery life: 268 minutes
#2 desktop replacement: Asus K60IJ-RBLX05
Although the Asus K60IJ-RBLX05 is an affordable 16-inch budget laptop, it's missing the processing punch and features that can be had for just a little more money.
Battery life: 205 minutes
#3 desktop replacement: HP Pavilion dv7-3165dx
People who would rather have a big screen instead of great battery life will be happy with the HP dv7-3165dx.
Battery life: 178 minutes
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