Buy-it-for-Life E-Bike Battery

I'd love this kind of innovation for power tools... The price of a Milwaukee M28 battery is bonkers these days. The cheap Chinese replacements are hit or miss... some come doa and Amazon complains they will terminate your account if you return too many of them.

Isn't there problems with replacing a single cell causing the battery management system to go whacky? I was under the impression that the cells need to be balanced with each other in some fashion.

Battery cost + density is getting better so quickly the idea of a "BIFL" battery seems silly to me.

Sadly no support for the Bosch system.