Hi Guys, I have a 4 year old unibody MacBook and have noticed the battery has started to expand. I've removed the battery and I'm running on just the power cable, and I understand I should get a new battery to replace the old one. My question is - does anyone think I'd be able to get one for free replacement if I took the old battery into an Apple store and waved in front of a genius? Have read around online and people have posted about similar experiences, even when the MacBook was as far out of warranty as mine. Just wondering if anyone has tried it recently (in the UK) and had any luck? Any stores in particular that might be more likely? London? Would rather try this than shell out £100 for a new one, or a knock-off one on amazon. Cheers!