I found last time I needed a battery that Tayna got it completely correct and delivered next day.
This is
their suggestion. If you want to shop around, it's a size 110.
But like they say, you should really check it against what's in there first.
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Current: 2012 C70 D3 SE Lux Solstice Geartronic, Caspian Blue.
Also: 2002 Audi A2 TDI SE, Crystal Blue
Previous: 2008 C70 D5 SE manual, Flint Grey.