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Dell (DELL) - Get Dell Technologies Inc Class C Report expanded last month's laptop battery recall program by 100,000 units.

The Round Rock, Texas, company said it received unexplained "additional information" about Sony battery packs linked to a possible risk of fire or explosion. Dell is now recalling 4.2 million Sony battery packs, up from the previous 4.1 million.


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, Toshiba and Lenovo have also recalled Sony laptop battery packs after the devices were said to overheat in some cases and catch fire.