I had a tech came in to take a look at it. the tech is also from the same company that sold me the pallet jack.
The tech said that it is the battery, but I don't quite buy it as when I boot up the pallet jack, it said 100% on the display, and I have barely used it for 30 mins.
I do not have the charger installed yet (need to hardwire to a line), so I can't tested if it will be different after i charge.