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by ssl-3 707 days ago
It isn't that simple today, but it can be.

Integrate the new-fangled battery (of whatever specific chemistry), the BMS, and the heater into a box with just two posts on top (just like lead acid batteries have had for over a century). It can be designed to take care of itself.

And if it's cheap enough to produce and sell, and offers good enough performance over its normal usable lifespan, then it doesn't need a diagnostic interface for sorting out issues any more than a lead acid car battery does today.