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When I was shopping for a used BEV they advertised various cars with different "max freeway range". Basically they fully charged it and then drove it until the charge ran out. Not exactly friendly to the pack, but it is one way to test the health.
With a used Fisker or Volt you could fully charge it then drive a consistent speed on the freeway until the ICE turned on. That would give you some idea of pack health.
(Other factors such as ambient temperature could skew the results a bit, but someone could try to factor that in as well).
Another thing they can do is measure full pack voltage when fully charged. A tired pack tends not to hold the same voltage as a brand new one.
Yet another test is to measure differences in cell (or slice) voltage when you run down the pack. A tired pack may have some cells (or slices) that discharge more quickly than others.
A new industry will probably crop up to do this sort of work once there are enough PHEVs and BEVs on the road.
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