I bought a new iPhone 3GS battery for my phone. My phone couldn't be repaired as the old one had leaked so I have a new battery going spare.
It seems a shame to waste it so I will post it to someone that wants it. It's unused and comes from China (as they all do). It's free and NOT guaranteed in any way.
If it doesn't power your Mercedes or explodes into a million pieces then it's entirely at your risk and not mine :)
btw if you want to trade me for it and feel generous then an iPhone 5 would be nice lol.