Thinking about road trips where we often sleep at night, suppose we could charge a portable pack in the room where we sleep? Then plug it into the Aptera in the morning to provide some extra milage during the day. What would be a good weight/power balance?
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Heat shouldn't be an issue for a portable pack, with A/C at home/work: Even with 7-year-old technology, my EV's batteries generate very little heat even sealed in a case, doing a full recharge in only 4 hours.
A portable pack would only generate about half as much heat for a full recharge in 8 hours of work or sleep.
I, too, am a little bit curious how THEY are planning to "just convection cool to save weight." in the car, although eGolf apparently does that with no significant degradation. What gives non-liquid cooling a bad reputation are phones & laptops which not only have NO cooling, but also have degradation-inducing small buffers at their top & bottom charge limits AND are much more likely to have harsher full discharge-to-dead cycles.
Reportedly all those factors also apply to the 1st-gen Leaf. Subsequent higher-capacity models got increasingly bigger buffers & shallower daily discharge but still apparently sealed in a heat-retaining case.
I believe the issue with imbalance is mostly that it reduces pack lifespan, much like rapid charging, or driving/braking harder. So it's a user choice, but it's nice to HAVE the option of a portable pack, much like it's nice to have the option of high-current charging, acceleration & regen. Still, it might be possible to make the cells balance while driving, maybe by taking motive power from higher cells, & putting regen power into lower ones.
My Fiat BEV's pack only balances when charged to 100.0%. Some after-market home L2s stop short of that on some Fiats, yet one user with that setup just reported a slight issue after over a year.