I have been advise by 2 garages that my battery is on its last legs and needs replacing (did have an idea beforehand, just needed to confirm) So does anyone know what the specs of the modern GM Battery for my DTi. i.e Cranking amps, Ah has it changed much from my original 2003 battery.

The GM one is £62 inc vat on Trade Club

The one I got in now is 70ah, 450A(DIN)