Hi, I have just bought a used MacBook 12" 2015 base spec. Came boxed but the charger was missing as was told it had broken. Got it for a steal so happy with it. Went out and bought a new one today (29w genuine apple) and its taking absolutely ages to charge , was on 41% about an hour ago and just on 54% now. Thats a genuine apple charger but not a genuine apple cable and also its a usb-usb c cable so I had to plug a usb c to USB adapter into the power brick and then the non gen cable into the MacBook. Could this be the reason behind the slow charging?