Two AA batteriesThe Magic Trackpad requires two AA batteries to run, and Apple provides them with the device. Those who really want to go green can replace the standard batteries with rechargeable ones. Apple will even sell you a battery charger and six AA NiMH batteries for $29 (US).
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Bill Detwiler is Managing Editor of TechRepublic and Tech Pro Research and the host of Cracking Open, CNET and TechRepublic's popular online show. Prior to joining TechRepublic in 2000, Bill was an IT manager, database administrator, and desktop support specialist in the social research and energy industries. He has bachelor's and master's degrees from the University of Louisville, where he has also lectured on computer crime and crime prevention.