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I'd get rid of the NAPA battery (probably the original battery failed just before the lease was up on the car, and the owner was too cheap to buy the correct battery).
Clean up everything and install an MB battery with the hole for the tube.
In answer to your question "why is it there", just look around and tell me where else it'll fit? It's all space management these days. Plus the battery is a fairly heavy component, you get better weight distribution with it there. It's a safe enough location for it if it's vented outside as intended.
Gilly
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