It's very likely that we'll end up with tiered batteries in EV's before long. Some amount of the capacity will be fast charge/discharge, some amount of it will

It's very likely that we'll end up with tiered batteries in EV's before long. Some amount of the capacity will be fast charge/discharge, some amount of it will be capacity with slower charge/discharge with a higher density available. Think of it like modern SLC backed QLC flash storage. As long as the usage profile fits inside of the cache, it runs as though the entire system is cache.