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Active systems are more prone to failure, and possibly too energy intense depending on the flow required. The most obvious solution is to redesign the battery compartment to contain less airspace, then fill it to the brim, but I'm not an expert on moulding plastic, so that's not currently one...

Awesome! Sounds like it's an idea on the right track. :D Apparently 1 litre of mineral oil is somewhere around 2 pounds? Not sure exactly how much is required, but it probably would be like having another person or two in the vehicle. Edit: From the midpoint: 5 gallons = ~19 litres. 19...

Err - are you sure about that? If true, yowsa, that's a lot! https://chargedevs.com/wp-content/uploads/2015/12/NIssan-Leaf-Battery-Pack.jpg I saw on a mineral oil cooled PC site that STEOil makes "tech-ready" (Electronics safe) mineral oil, and sell it in rather large quantities. "Crystal...

Did anyone try the mineral oil cooling? Pure mineral oil is non-conductive, and transfers heat about 5x more efficiently than air. If you had the battery packs surrounded with the stuff, it would provide a large semi effective heatsink, keeping temperatures closer to ambient longer. If your...