IMO the problem isn’t the batteries per se. Those 6kWh or so of batteries should be under $1k wholesale. The balance of the system is egregious markup, packagin

IMO the problem isn’t the batteries per se. Those 6kWh or so of batteries should be under $1k wholesale. The balance of the system is egregious markup, packaging, safety certification, the mess that results in no one’s batteries interoperating well with anyone else’s equipment, etc. Cutting even 50% off the cells won’t help much. (Hmm. Maybe Na-ion will end up with a nice discharge curve so that one can actually parallel or, better, series-connect a bunch of batteries, use an external BMS without fancy per-cell connections, and get good results. Despite the number of vendors selling two-terminal LiFePO4 batteries with internal BMSes, they really don’t work well. Lead acid, for all its faults, works fine with dumb batteries.)