Have a Bobcat Excavator Mod 442 and cannot locate the battery on it, no service manual can't find jack on the web.
I am guessing you opened all the access doors. Find the red main lead from the starter and follow it could be under the seat or under a panel in the floor.
It's not under the seat, although there is a cabin filter and the fan/motor for the heater under there.
open the back engine compartment then look down into the hole to your right you should see it . looking at the back end on the right side of the machine should be a door to open and get to it . thats they way mine is .