There are sellers on Ebay offering aftermarket batteries for the Sony Vaio VGN-AR series.
These batteries come with a BIOS update file that is supposed to allow the system to work with thier new "aftermarket" battery. PLEASE BE AWARE THAT THE BIOS THEY SUPPLY YOU WITH TO UPDATE YOUR SYSTEM WILL KILL YOUR LAPTOP.
The file that the sellers on Ebay are supplying are INCOMPLETE or Corrupt. I've been contacted by several customers that purchased these aftermarket batteries that attempted to do the BIOS update and failed.
There is no known way to get a good "BIOS Dump" for the newer Vaio models, and since there is NO available BIOS download from the Sony site for these models, I can only assume they attempted to Dump a BIOS (in order to modify it for their battery) and never got the full and complete BIOS.
The models are VGN-AR series.