Numbers swell in Sony battery recall

Toshiba, Fujitsu and Dell recalled more Sony-made laptop batteries Friday, swelling the number of units involved in the massive global recall to more than seven million.

Early Friday, Sony Corp. formally asked manufacturers using its problem batteries to carry out a recall.

Sony has said the batteries could pose a risk of fire in rare cases when microscopic metal particles generated during manufacturing come into contact with other parts of the battery cell, leading to a short circuit.