Plug the notebook in with the battery in place and start up the computer. Has your notebook been acting funky lately? Does the battery die when you least expect it? Does it run for only 45 minutes on a charge? There's a good chance that your battery is worn out and ready for retirement. Only a handful of online stores had a power pack for the MacBook Pro. It turns out that lots of places carry replacement batteries for the ThinkPad R50 the same battery works with ThinkPad T40 series notebooks. Many of the companies also sell AC adapters and batteries for mobile phones, digital cameras and handheld devices. I found several places that sell batteries for a wide variety of notebooks made in the past 15 years, from ones introduced earlier this year to relics like the 12-year-old Texas Instruments Extensa 600. With the battery part numbers in hand, I did a little nosing around on the Web. Both machines have worn-out batteries that power the systems for half the time or less than they could when they were new. I also went looking for a new battery for my two-year-old MacBook Pro. With the Lenovo replacement battery for my ThinkPad R50 selling for $160 - about half what the notebook itself is worth - there was certainly room to save some money. Replacement batteries for the MacBook Pro and the ThinkPad R50. I went on a mission to find out whether aftermarket replacement batteries are a good deal, safe and reliable or a dangerous fraud. Buying an aftermarket battery often goes against the advice of laptop manufacturers, and in some cases can even void the warranty. We all want to save money, but not if it puts our notebooks at risk. "Lots of people buy a second battery, and the longer you keep a notebook, the greater the chance that it will need a new battery." "This is the result of the enormous popularity of notebooks," Saxman explains. The trade in aftermarket batteries is growing quickly, perhaps by as much as 30% a year, according to Don Saxman, an analyst at BCC Research in Wellesley, Mass. There are two basic types of notebook batteries: the brand-name batteries that the manufacturer sells and the aftermarket batteries that are available from third-party resellers - often for a significantly lower price.
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