Worryingly, when checking mine on an Inspiron 6400 purchased in April this year, the battery number isn't on the list but I discovered a bulge in the bottom of the battery casing with a two inch split in the case. I have emailed Dell support and await a response as it will have to be replaced. Worth regularly checking laptop batteries!
Am in a bit of a pickle with this. Bought Custom Laptop October last for son for use in Saudi. That is where it is now. It is in my name, but he paid for it. Looks like he will have to bring battery back with him next home visit and I will sort it with Dell. Question is , is there a 'return by date' as he has no certain return date. Could be months before his laptop will be truly portable again. Alternatively, does he push his luck and not bother and carry on regardless. Have emailed all the info so he has a decision to make.
Checked on the Dell website, and sure enough, mine's one of the suspect ones. Supplied my name and address and await delivery of a replacement. Many of my colleagues with identical laptops are not affected.
Curio; your son can check on the Dell website to see if his battery is OK or not, and if he's unlucky he can apply directly for a replacement. For the first part all he needs to enter is the serial number from the battery, and for the second it just requires his name and address.
In the circumstances, Dell might be accomodating; if your son could ship the battery back to the UK at his expense, Dell could send a replacement at its expense, or even cover the cost of both shipments. No harm in asking, given the nature of the recall and your son's position.