Iria

"Sadly, as far as we've come in terms of cramming better microprocessors, sharper graphics and beefier storage into netbooks and laptop computers (including both Macs and PCs), energy management has plagued portable computing since its inception. On the bright side though, thanks to more powerful batteries, processors with clever energy management and smarter software, the situation is getting better all the time. You can help, too. Aside from lugging a spare battery, which isn't a bad idea, the following are a few tips for squeezing more juice out of your laptop."
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Source: Digital Trends