...so I was installing a new battery on the GF's Nighthawk 2fity. I added the electrolyte, charged it, and let is sit per the instructions. I attached the positive terminal, and as I ws 'trying' to attach the negative terminal the battery started hissing and getting hot. I disconnected it and let it sit for 5 minutes. I tried again with the same result. WTF? Did I get a bad battery? I never even had the ignition turned on.