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My plan was to buy 2 lithium-ion batteries. The supercap would live under the hood and provide the cranking juice. The lithium-ion battery would stay in the glove box or somewhere accessible but out of way of the driver. I'd start off with a charged battery; something like 15v so the alternator stays off. By the time the alternator needs to come on, the cabin would already be warm from running the heater.
After parking the car, leave the battery connected. The next time I go to drive the car, I swap the battery with a freshly charged one (and warmed from being indoors). The supercap maintains voltage during the swap so I don't lose memory settings. The whole cycle repeats again, with me taking the previous battery with me to charge while the car sits parked.
No messing with battery heaters. Balance charging done on a proper charger every time I park the car at home.
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