I wanted the battery replaced on my key fob and was told it can be complicated and people often mess up when doing it themselves. Any way I was quoted £14.95 so I agreed as I didn’t want the key not to work and couldn’t unlock my car. It took the man maximum 2 minutes to put a £1 battery in it. I got home and thought I would replace the battery in my identical spare key and it took me 30 seconds.