HP has announced voluntary recalls and replacement programs for some of the battery packs used in some HP and Compaq laptops. If you have one of these recalled battery packs, you may be eligible to receive a free replacement battery pack.

These recall programs were announced on May 14 2009, October 30 2008, April 20 2006, and October 14 2005.

If your battery back is identified as being included in this recall program, you should replace it even if you are having no problems with the battery pack. This is due to a potential saftey issue with the battery pack.

Full details can be found here