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Have had great luck with the CTEK tender-I have the same one Porsche used to sell with their logo. Last year I thought it finally died, bought a new one from Amazon and then figured out it was only the GFI in my basement, which is on the same circuit as my non GFI garage outlet had tripped! I did not go AGM but with a traditional Interstate battery. Can't remember how old it is but I bought my S new in 2003 and this is the only replacement battery ever purchased.
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