> They were always really expensive, heavy and had low energy density (both by weight and by volume).

Sorry, I misread your comment. I thought you were talking about LiFePo4 production ending in 2023, not NiFe.

I know that NiFe batteries are not suitable (or possible to be precise) to be miniaturized. :)

I still wish market does research on longevity as much as charge speed and capacity, but it seems companies are happy to have batteries with shorter and shorter life spans to keep up with their version of the razor and blades model.

Also, this is why regulation is necessary in some areas.