Hi, I replaced the battery on my 1.3 diesel estate last year. However I kept the original and attach a picture of it. Seems to be 63 ampere hours. I take it that means it could generate 63 amps for 1 hour or 756 watts (12v X 63 amps) for 1 hour? Peak output stated seems to 450 amps. I don't think my new replacement battery was nearly as powerful, but it works for the moment. Hopefully this helps you!