Abstract: A containment apparatus for collecting electrolyte from a battery relief vent is provided. The containment apparatus includes a body comprising a reservoir, a relief vent aperture, an internal baffle, and an upper vent aperture; a push-on connection that attaches the relief vent aperture to the battery relief vent; and a viewing window on an external side of the body. The containment apparatus attaches to a pressure relief vent on a battery to capture droplets of electrolyte that are released from the battery relief vent. Liquid electrolytes travel through the relief vent aperture and into the reservoir, and vaporized electrolyte condenses on the baffle and falls into the reservoir as droplets or travels past the baffle and is directed through the upper vent aperture via the walls. The device prevents electrolytes from accumulating on the outside of the battery and associated hardware within the vicinity of the battery.