Hello

I would like to know how do we rate a battery with its AH rating.
I have seen a forklift with a drive power of 5.5kw and pump power of 7.5kw and having a battery of 48V/500AH and it says that the battery will last for 5 hours.
but if we go to see then 5.5+7.5=13kw and for 5 hours=65kwh for both motors
whereas the battery power is 48*500=24kwh. so how can the forklift even run for 5 hours or so?
and even if we aassume that they wil not run at full speed all the time and if we divide the 13kw/2=6.5kw and for 5 hours=32.5kwh and still the battery is not sufficient
so is my calcualtion wrong or am i missing some parameters