What ever you have to do to make a optima fit it's worth the hassle. First there sealed and don't leak while off road and it don't take much of a lean to cause a normal battery to start leaking. My wife left the dual screen DVD player running in her car for over 24hrs I was already getting the jumper cables out when she started it up and it turned over with out hesitation. I can't wait for mine to fail so I can get one of these in my Jeep.