Charger not working at 9V speeds

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New member
Jun 23, 2014
Hi guys,
I've changed the cable on my Zenfone 5z charger and bought a new one from ASUS support. What I've noticed is that the charger is only working at 4.234 V and not 9 V as suggested on the charger. Does this mean I've got a faulty charger or is this something to do with my phone? My 5z is out of warranty and I'm kinda confused about what's happening.

Any help is appreciated and TIA.