Hook up your charger/discharger/analyzer, e.g. SuperBrain 989, across each stick in turn. Keep charging and discharging each stick until it stops improving, then write down how many mAh you were able to get out of it. The weak sticks are the ones whose performance falls substantially short of the rest of the sticks'.
You also need to do the self-discharge test as described in the OP, to see if you have sticks that need to be replaced due to self discharge.
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