This happend to me on my 12 inch powerbook G4. Since I noticed it early, I called applecare and they said they would replace it... but that was after convincing them something was actually wrong with it. Everything about the battery worked but the lights when i pushed the button, they worked when it was charging and that was it. So if you can call apple and convince them that something is wrong I am sure they will send you a new one if those lights really matter to you.