It’s spreading (as I mentioned it would here):

Ten days after Dell’s record-setting notebook battery recall, Apple Computer Inc. told its customers Thursday to return 1.8 million batteries that could cause their Mac laptops to overheat and catch fire.
Both recalls involve lithium-ion batteries made by a Sony Corp (NYSE:SNE – news). subsidiary in Japan, where the manufacturing process introduced metal particles into battery cells. Makers of battery cells strive to minimize or eliminate the presence of such particles, which can cause computers to short circuit, or, in extreme situations, catch fire.
In its recall announcement, Apple said it has received nine reports of lithium-ion battery packs overheating, including two cases in which users suffered minor burns and some involving minor property damage. The Apple recall only applies to older notebooks – not the just-released MacBooks and MacBook Pros.
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Apple’s recall covers 1.1 million rechargeable batteries in the 12-inch iBook G4, 12-inch PowerBook G4 and 15-inch PowerBook G4 laptops sold in the United States from October 2003 through August 2006. The recall also covers an additional 700,000 batteries in laptops sold abroad, according to the U.S. Consumer Product Safety Commission.
The recall affects only laptops that run PowerPC chips built by IBM Corp. and Freescale Semiconductor Inc. It does not affect Apple’s Intel Corp.-based models, including the MacBook and MacBook Pro.
Apple notebook owners were told to stop using the batteries and to remove them from their laptops. The machines can continue to be used as long as they’re plugged into an AC power source.
Apple asked customers to consult a Web site or call a toll-free hot line, 1-800-275-2273, to determine whether they have a battery that is covered by the recall. A free replacement will be shipped to affected customers.