The dodgy batteries were found in 40 different Toshiba models of PCs including Portege, Satellite, and Tecra models. The CPSC estimates the recall will affect about 91,000 units sold in the United States and another 10,000 sold in Canada. Toshiba first revealed the battery pack problems when it announced a voluntary recall in late January.

Anyone affected can receive a free replacement battery from Toshiba – assuming they have not already caught fire. The numbers might have been higher. Some users might have bought extra and replacement battery packs, as well as packs replaced during servicing, so it is worth checking out.

Toshiba has a complete list of all models that are potentially affected by the recall on its site. The computer maker also has a utility you can download that will automatically check your system to see if your battery is part of the recall.

This is the largest recall by Toshiba due to defective batteries since the company was caught up in the major Sony battery recall that started in 2006.

So far, the CSPC and Toshiba are aware of four instances where defective battery packs overheated and melted. Those events didn’t result in any injuries.