> Can we please get standard battery form factors, voltages and connectors: like AA, AAA, C, D, 9 volt, etc, but in a larger size similar to lantern batteries and car batteries?
This exists already. 18650 is in widespread use and now 2170 is gaining traction. Each cell is already a standard voltage, 4.2V at the top end, 2.75V on the bottom end (or lower depending on whether you want to risk permanent damage).
> Can we please get batteries with built-in protection circuits? I want to wire them in series or parallel at any voltage and have them "just work" and never explode. Bonus: please do this with solar panels as well.
These also already exist. Tesla will never use them because the BMS handles that job, which is more effective and cheaper.
This exists already. 18650 is in widespread use and now 2170 is gaining traction. Each cell is already a standard voltage, 4.2V at the top end, 2.75V on the bottom end (or lower depending on whether you want to risk permanent damage).
> Can we please get batteries with built-in protection circuits? I want to wire them in series or parallel at any voltage and have them "just work" and never explode. Bonus: please do this with solar panels as well.
These also already exist. Tesla will never use them because the BMS handles that job, which is more effective and cheaper.