Batteries are not like gas tanks. 80% of original capacity doesn't mean you have 20% less, it means a lot of other things too. These are chemical reactions which happen which lead to lots of other effects, like higher internal resistance.

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cuttothechase 3 days ago | parent [-]

Is this true!?

So does it mean that if I use a 80% capacity battery my actual functional value that I get out of it would be considerably less than what the 80% would infer?

	▲	Eisenstein 3 days ago \| parent [-]
		"The degradation rate of lithium-ion battery is not a linear process with respect tonumber of cycles, battery aging tests (Fig. 1) have shown that in cycling tests the degradation rate is signiﬁcantly higher during the early cycles than during the later cycles, and then increases rapidly when reaching the end of life (EoL)." Actually, 80% is considered effectively 'end of life': "Battery end of life is typically deﬁned as the point at which the battery only provides 80% of its rated maximum capacity" * https://www.researchgate.net/publication/303890624_Modeling_...