Hoodie,
I have a predator myself and also a Nitecore D4 EU version
The predator charges my batteries "very" fast in comparison to my nitecore as it has 2 amp charging - D4 only charges at 750 milliamps. I couldn't quote an exact time but I guess under 2 hours from empty to full.
I've read that charging at low amps will extend the life of my batteries so I have 3 sets and cycle them through the D4 the vast majority of the time, but I have been away and used the predators' charger with the result I spoke about above.
It sounds to me like the previous replies are correct and there is a problem with the mod or the charger so I'd advise you chase this up.
One thing you can do is weigh the batteries - if they are not very close to the 45 - 48g (taken from spec sheet
here) they are most likely fake.
Hope this is helpful