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In a 40, I'm guessing it might be possible to fill more of the battery through regenerative braking down a mountain. In other words, if you lived on a mountain like I do, you could charge your 40 to "100%", then pick up additional charge through regen on the descent. Has anyone ever tried this?
The only time my regen has been capped is when it's been cold out.
Descending the mountain I live on, perhaps a 40 could be charged to ~80% of the 60 kWh usable capacity. Of course, regen tapers as SoC rises, so it's very, very hard to completely fill an EV battery by descending a mountain. Towing would be an interesting experiment, but I wouldn't want to chance a warranty issue if it were my car.In that case it seems kind of obvious that the regen work-around would in fact work and allow you to charge to where the 60kWh battery is full... Not sure what the point would be but it would be fun.
or if someday they allowed 40's to pack swap up to an 85.
"Someday" they won't have to "allow" you to do anything. The day will come when you can take a Tesla to a non-Tesla service shop and get anything you want done to it. I look forward to the day I can take mine in and get the batteries swapped out with new (not yet in existence) cells with quadruple the capacity - and have a 600 mile range car. It will happen. We just have to live long enough.
For the moment I am just looking forward to the Falcon 9 returning from space and landing on a landing pad in the ocean tomorrow!!! AWESOME!!!! I'm a big Elon Musk fan. SpaceX and Tesla. Truly remarkable.