ok so i bought a ctek mxs 5.0 charger and used it and all good so far, manual shows the first step as pumping out up to 15.8v (this applies to the other models too the 4.3, 3.8 etc) this cant be good can it?

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