Your battery will never drain fully even if it says "empty" or "0%". The reason for this is that modern LiIon batteries have complex electronics that will prevent them from doing so, as that could cause damage to the battery and even to the computer. So even if the battery is empty, there is still a remaining charge inside to prevent it from taking damage. In your case, your battery is simply dead. The time you spent reviving it, well, calculate how much you earn per hour and how much a new battery from Apple, not a third party one, would have cost you. ;)