While waiting for my Model 3, the one thing I think about the most is to upgrade the battery or not. Will I NEED NEED NEED the big battery for 90% of my daily travel needs? No. But there are times it'd be nice to have it. I was thinking that maybe Tesla could offer "temporary" battery upgrades. For a set fee, like $100 or so, turn your 60 KW Model 3 pack into an 80KW pack for a month at a time. This would give the extra capacity needed for long trips, but then you wouldn't get stuck paying thousands for a big battery that you don't need in the average week. This would allow Tesla to earn extra cash from those who opt to not get the big battery all at once. Good idea?