anyone got experience with the agms batteries? can a same rated one be used in our X5's? or is it as I read somewhere that modern cars alternators churn on slightly more V that is needed for the agms? and that 'older' non start stop cars e.g the X5 alternator gives out anywhere from 13.6 -14.1?

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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N