What cars are you using? Honestly my first Century was the Marathoner and I'm disappointed with it and will never buy it again. It lasted over 2 years for my car with countless jump starts within that duration coz I didn't use the car for 5-7 days. Now I'm trying the Century Ultramax which is supposed to be their best model and it is better but not by much. It also already need to be jump started a few times, not yet 1.5 yrs though.

I also often hear recommendations for Amaron but never hear that they can last 7 years! Maybe next change I will try this brand but I will not try Century anymore, not even their Ultramax.

Use in your GTI? My Ultramax is around 1.5yrs now. It got warranty of 18 or 20mths if not mistaken so if died under that then you can claim a new unit.