bought a brand new battery for my 318. Works/starts great been using it for a month. recently, I noticed little specs of ruined paint in my engine bay, I thought it was brake fluid leaking from somewhere and splattering all around the engine bay.. turns out one of the vents/caps at the top of the battery is leaking, and the battery is all pushed out and looks like it's about to explode. I stopped at the parts store and they tested my battery. With the engine off, the battery was fulled charger. At engine idle, the battery was getting 14.24 volts and was 90 degrees, and they said the alternator was good. I noticed over the past few days that the needle in the alternator gauge in my dash goes way past the 'C' mark, like the battery is getting over charged. Does this sound like a battery problem or an alternator problem?