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If fancy charger isn't charging or throws code on your half dead battery, hook up another good battery to it along with the one that needs charging. The charger will recognize the good battery and starts charging them both.
No more Optima for me. What a POS. I have had good luck with Exide AGM battery on my 4 runner. It lasted 7 years so far but its seems to be getting weak. I am sure it is made by one of the large battery mfgs?
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