I was looking at Ni-H2 battery technology today, mainly because a variant is shipped with the 2023 Toyota Crown Platinum. Fast discharge, slow charge, not very sensitive to temperature, 1/2 as energy dense as Li-ion, relatively safe, 35,000 cycles to 85% capacity. Used on satellites with a 15 year min lifetime.
Disadvantages: cost and it self-discharges 10% a day.
Toyota’s is a different design, they say.
Separately, there’s a startup company claiming to have brought the cost to parity with Li-ion; they’re aiming for the grid-scale market.