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sugarwood -- what make/model tender were you using? How frequently do you drive your car? Asking, as I frequently let my car sit for a week or 2 at a time and don't use a tender (unless its sit for a month or so) -- my last 2 AGM batteries each lasted me over 6 years and wondering whether frequent battery tender use is slowly "cooking" your battery.
Having dealt with the very messy aftermath of an overcharging situation with my last non-agm battery (which boiled out onto the battery tray and components beneath the tray), I will never install another non-agm battery in my 911.
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