According to German site MobiFlip , Samsung has released a power pack or extended battery for the Galaxy S under the name EBB-U10. It will certainly make your phone look less sexy but if you want the promised extra 8.5 hours of talk time then it’s well worth it ! Its not clear if you have to replace the back cover of your phone with this pack or if this fits into the microUSB port on the top. Price or Availability is not known
UPDATE: Area mobile is offering more info and a couple of pics !
With the new battery tray, the Galaxy S larger and thicker, and also weighs 70 grams more. At the request of AreaMobile Samsung said that the addition of battery by the end of September in Germany will be available. The price is € 69.90 RRP.