These recall's are more for covering there own arse i think. If something does happen (Say for instance your battery blew up) and the company hadnt issued a recall,then you could sue them.
If they DID a recall on those batteries before it exploded and you didn't know about it and your battery happends to explode,you couldnt sue them on the grounds that the company made it public and the public has the responsibillity to get the battery repaired/replaced by HP.
Also i think if you had registered your laptop with HP they would have sent you an email and it's probably on there website too.