HP announces voluntary worldwide laptop battery safety recall
If you want to confirm whether or not your laptop is affected, you can download a utility to perform an automatic validation. Otherwise, you can perform a manual validation by entering the laptop serial number and battery barcode into the recall webpage.
HP is advising customers who find their batteries affected by the recall to cease use of it immediately. Until a replacement battery is shipped, laptops can be run without an installed battery while connected to an external power source.