PM Sent! However, for those that are reading this or may read it later, our group 27,31,34C,51 and 78 batteries have vent provisions. Yes, a battery will only vent when it is overcharged, or on the rare occasion when a battery shorts out internally or maybe even if something in the electrical system shorted out, but in that case you would have other problems too. You may never have an issue, but it is sorta like not wearing a seatbelt because you have never had a wreck. You only need safety protection in the emergency, but the distance between the guard rail and pavement is very quick at 70mph sideways, may not be time to buckle up.
eCare Manager, OPTIMA Batteries, Inc.