Tokyo ? Sony urged a dozen laptop computer makers Friday to recall more of its batteries that could overheat, the latest headache for the electronics company struggling to regain its luster as the world’s premier electronics brand.

With two new recalls announced Friday, the number of lithium-ion batteries that are being replaced now stands near 7 million worldwide, Sony spokesman Takashi Uehara said. He refused to estimate how much it would cost the company.

Toshiba Corp. and Fujitsu Ltd. were the latest to tell customers to return batteries. A day earlier, IBM Corp. and Lenovo Group announced a recall of 526,000 batteries. Last month, it was Apple Computer Inc. and Dell Inc.

Toshiba is recalling 830,000 Sony laptop batteries in its Dynabook, Qosmio, Satellite Portege and Tecra models. Fujitsu later said it was recalling an undisclosed number used in 19 of its laptop models worldwide. Both companies said more details would be released later.