Toshiba and Lenovo have become the latest computer makers to recall laptop batteries made by Sony because of a potential fire risk.
Lenovo is recalling 500,000 batteries, while Toshiba is calling back 830,000.
China-based Lenovo said the problem affects ThinkPad laptops sold from February 2005, both under its own name and the IBM brand.
At Japan's Toshiba, the recall involves its Dynabook, Qosmio, Satellite Portege and Tecra laptop models.
Following similar recalls by Dell and Sony, a total of seven million laptops worldwide have now been affected.
Airport fire
Lenovo, which bought IBM's personal computer division in May last year, said it was ordering the recall after one of its laptops caught fire at Los Angeles airport.
Toshiba said its recall came on the advice of Sony.
Although Toshiba said it had not found any cases in which the laptops were at risk of catching fire, "we wanted to assure and satisfy our customers".
The dates of manufacture for the affected Toshiba computers were not immediately available.
Lenovo spokesman Ray Gorman said the company expects the financial impact of the recall to be "minimal", as Sony is "supporting us financially in this recall".
Dell is recalling 4.1 million Sony batteries and Apple 1.8 million.
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