[radomir_cernoch]

I think it's hard to define "the true 100%". It's always a matter of finding a tradeoff between capacity and lifespan – by defining a voltage range.

[aidenn0]

True 100% seems easy for LiPo; it's the point at which it spontaneously catches fire.

[layer8]

“Spontaneously” seems to imply that it’s not actually a deterministic point.