My boat accommodates three batteries. I need to add a 4th one to handle my new 24v trolling motor. Two of my batteries are up front and the third at the rear of the boat. The two in the front will be used for the 24v system. I know I can also run 12v electronics off of this set up (24v), but I risk the chance of interference and of running one battery down faster than the other in the 24v set up doing it that way. So, I have an extra compartment immediately adjacent to the two-battery compartment and I want to set up a 12v battery there to handle numerous 12 v electronic items at the front of the boat. This compartment is vented in two places. I want to avoid having to run wires all the way back to the back battery compartment. The back battery handles the power for my main 115 hp and 9.9 hp motors at the back. In addition, there are some other items connected to that battery and I don't want to add anymore. The problem is with this compartment I want to use for the 4th battery, the floor of it is slightly angled up because of the bow of the boat and not flat even as the other battery compartments are. My 4th battery will sit crossways in that compartment and be at a slight angle because of the angled floor. Across the narrow part of the battery, one side sits 1/8 to 3/16 of an inch out of level. I was going to level it out, but the compartment door barely closes without contacting the battery. If I use shims to level the battery tray and battery, it hits the door when it shuts. I know I took the long way around to ask this question, so bear with me, but is this slight difference of 1/8 to 3/16 of an inch going to affect battery performance?