Lenovo on Thursday sent out an urgent recall notice for 200,000 notebook batteries. Working with the Consumer Product Safety Commission, the computer builder said that the extended-capacity, nine cell batteries of roughly 100,000 R-, T-, and Z-series ThinkPads were at risk after the company learned of four instances where dropping the notebook triggered a minor fire. Over 105,000 of the same batteries were sold internationally, the firm added. Lenovo and Sanyo together said they were already redesigning the battery shell to prevent these problems in the future.

The recall only serves to compound Lenovo's existing troubles with batteries, which began last year when the China-based company learned that over half a million of its batteries were affected by Sony's global recall. Neither problem is related, Lenovo said, as the Sanyo batteries only ignite in a sudden impact.