First thing - welcome to the forums!
I have a different unit but I have found the battery box to somewhat challenging to get the lid on or off. Depending on the box some lids are easier to remove sideway but still pretty tight.
Can you post a picture?
Great choice for "Living within my means" and camping for one...
2011 Salem Cruise Lite 20RBXL & 2011 Toyota Tundra Dbl Cab
Camping History: 45 Trips / 133 Nights / 3736 Miles
FRF Social Group: Campers of the West