I bought a rather expensive Bosch battery just over 3 years ago as it had a good warranty. Tayna delivered it the next day. The battery started playing up two months ago with slow cranking and not starting the car. I had to jump start it a lot. I had the electrics checked out and bought a second hand battery from a scrap yard. This second hand battery didn't fail me and still hasn't. I performed all of the home tests with the Bosch battery as Tayna suggested (including removing it from the car and trickle charging it). It worked for a day and then failed again. Tayna wanted me to return it. This cost £20, no fault was found and it was returned to me. A week later I installed the Bosch battery. It started my 2009 diesel s-max straight away. I took it for a 40 minute drive, parked for 10 minutes and came home. It started OK again. The next day I did a 10 minute journey. I was parked for 5 minutes (getting diesel) and the car started, but struggled to turn over. I drove home in 10 minutes and left the car until the next morning. The next day it would not start at all. I used a jump pack and it started. I did an hour journey and parked for the day. When I went to start the car, I needed to use my jump pack again. I took the battery out and put in the second hand battery back in. I had no more problems starting ever since. I invested in another charger and trickle charged the Bosch battery. It did the same as before, worked for a couple of times and died... Back went in the second hand battery with no problems. I am now at a loss. I have already spent £20 for you to say that the battery is fine. I'll use a local motor factors in future.