Kevin, If you tape the heaters to bottom side of aluminum sheet like I did, I think it is a good idea to put two or three layers of a tough tape like Kapton over the place where the leads are riveted. Over time the weight of the batteries may cause those slightly raised riveted leads to punch through the insulating layers on the heater causing a short between them via the aluminum. Nothing catastrophic, the fuse will blow, but a pain to pull the batteries to replace it. The somewhat soft insulation underneath the heater helps prevent it too - heaters pressing down into it. You might also search on diyelectriccar on battery heating. Been a lot posted there over the last several years. Some have used the thin film resistive heaters that are used for radiant floor heating for example. You can purchase it by the foot. The Farnums are just one option. Taping to an aluminum pan that fits snugly in the box helps spread the heat as well as protect the heaters.
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