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80% is the lead-acid standard to determine "end of life." It's been carried over to other chemistries.
It is NOT relevant to NiMH in a Prius. The battery is grossly oversized for the needed function in most roles. Failures do not typically occur until the battery approaches 30-40% of rated in terms of capacity.
Providing a reconditioned battery to 80% or greater rated capacity is better than most.
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