Could the 2170 battery be more then just bigger and possibly more dense. I think Samsung talked about their new 21700 battery being able to charge much faster at CES. Elon talked about higher powered superchargers. It seems like the 2170 and Supercharger3 are tied together. Also the new battery guy at Tesla indicated his contributions would be in products in a couple of months. That would be around the time the 2170s are being used in cars. I could see the powerwalls not needing the charging speeds, but maybe the 2170 for cars will be slightly different and charge faster. There is a link to the Samsung battery on electric.com . My post showed up as spam with the link. If the 2170 can charge faster then the resistance must be lower meaning they could dump power faster. So then the power from the battery might not limit how fast the car accelerates. Then with power being software limited or limited by the motors the peak power range would be much flatter. You would be able to accelerate just as fast at say maybe 50% charge as a full charge. Also with the superchargers no longer being free Tesla could now allow you to put power back to the grid or your house in case of an emergency. I think we all know if supercharging was still free there would be "that guy" who would stop everyday at the supercharger and charge up so he could power his house. So Tesla can not add powering your house from your car until they came up with a way to prevent "that guy".