I'm no expert, but getting no response at all, even when attached to jump leads, would suggest something other than the battery (or something as well as the battery). Perhaps before trying anything else, could you drop the Mondeo battery into the '8? If it still doesn't fire up, it's not the battery. But if it does, then a new battery should sort it. I know that's technically the same as jumping from the Mondeo, but there might be something amiss in the '8 battery that stops it taking a jump - maybe?
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .
Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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