I have a suggestion for all those who need to get the battery out. If you start from the top of the battery where the contacts are, you will notice that you can bend the top of the battery to some extent by lifting it with the plastic tool. This allows you to slip in the blade of a slim spattle (even if the blade is an inch wide). Since the cage of the battery is made of metal as well there is no danger for the chips and circuits. If you rock the blade to the left and to the right and apply a littel downward pressure you literally cut through the glue underneath the battery and will get it out in no time. Plus, there is no danger of cutting the antenna ;)
I hope it works for you guys.