The 4 cylinder model uses a 70Ah battery, the V6 has the same ancilleries to run so i'd definately go with a 70. Bosch have a good name for batteries, most reputable brands will offer at least a 2 year warranty on their product.
I replaced the batter on my V6 last summer...if I am not mistaken I did buy the Bosch and the high end model thats supposed to last up to 4 yrs or something Good stuff though, no problems so far and its been a year
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