So my macbook battery has depleted over the years until i've finally been faced with a 'service battery' warning on my battery tab. Obviously apple charge a load for replacement - has anyone fitted a new battery for a macbook pro themselves after buying it online? Was it cheap? How does it perform? and where from? (I used a mbp mid-2012 13"). It's very hard to tell because Apple's opinion is obviously 'Don't do it yourself, let us do it, it's the only way'.