The following notice has been issued by the manufacturer:
There is an issue with the battery packs included in Toughbook CF-H2 tablet PC series manufactured from June, 2011 through to May, 2012 – and those sold as accessories or used as replacements during servicing. Because of a manufacturing problem, these particular battery packs may overheat and, in rare instances, cause the notebook to ignite.
To prevent any accidents, Panasonic will replace these battery packs free of charge. Please check the model number and lot number of your tablet PC battery pack. If yours is one of the ones affected, turn off your tablet PC, remove the pack and contact us straight away.
How to identify if your battery pack is affected:
More information on Panasonic's site on how to identify the part: http://tiny.cc/47cmgx
Panasonic Service Centre
Cardiff CF23 7XB
+44 (0) 8000884324