www.voltphreaks.com
4.5lb battery and 400CCA. It's as good as the OEM battery and 1/10th the weight.
Although they've significantly raised their prices from when they first introduced them.
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2010 BMW 335d "Ha! She wants the D."
2006 VW Jetta 2.5
Once upon a time...
'03 VW GTI, '99 Audi A4 1.8TQ, '00 VW Jetta 1.85T, '09 BMW 335i xDrive, '04 BMW Z4 3.0i, '01 Audi TT 1.8T, '04 Volvo S80 2.5T