Smarterware

Unplug Your Laptop Regularly (When In Doubt)

A friend complained to me that after only two years, she had to replace her laptop's battery because it wouldn't hold a charge. I found myself telling her that she shouldn't keep her notebook computer plugged in continuously, because it would kill the battery faster. Then I stopped myself: Was this just outdated geek lore rendered obsolete by modern batteries?

Yes and no. It depends, of course, on what kind of battery you have. Battery technology has come a long way over the years, and surely in 2009 you don't have to worry about how long your laptop's been plugged in. However, one major notebook manufacturer (which ships Lithium-ion batteries) thinks you should, and suggests adding a reminder to your calendar to deplete and recharge your battery once a month. To quote: "Apple does not recommend leaving your portable plugged in all the time."

My friend, however, has a two-year-old Dell. Cursory Googling for her model didn't turn up the equivalent of Apple's definitive statement, only lots of opinions which ranged from "it's a non-issue" to "yes, it kills batteries!" Dell.com's battery recommendations page doesn't say anything about not keeping your notebook plugged in. HP's battery tips page doesn't answer the question, either. I pored through my wife's ASUS Eee PC user guide and didn't find any warning about continuous charging. A non-mention might make you think it's a non-problem, but if this is an issue for Apple notebook batteries, it is for PC notebooks with lithium-based batteries too. When I asked, my Twitter followers returned mixed replies, but many notebook users (both Mac and PC) DID report anecdotal battery problems when the machine was plugged in constantly.

Read the rest »