Buying cheap LiIon replacement batteries that might burn down your house is a level of living fast & dangerous that I just wasn't made for. Removing an already bloating MBP cell using sharp tools is a terrifying experience. I blame Apple for encouraging this by over-pricing genuine repairs.

This is a worry that almost came true to me last week. My sons Laptop charge cord stopped working so went to Facebook and found someone selling a charger for it. The charger was from amazon they said. It was an obvious fake and looked nothing like the company provided one but tested it and the voltage output was correct so used it. Fast forward several months and last week I noticed the casing around the cords power supply was deformed and had at one point almost melted. Scary to say the least.

Apple restricts third party repair shop's access to genuine parts as much as possible. So, it is partly their own fault that high quality parts are not available with third parties.