you also have to pay attention to the charge leads, clean the inner battery plugs and check the clearance of the male plugs.
this way you can get a coherent value to compare time after time.
some chargers really measure the IR others calculate it.
in my experience, with my charger (a D200), I can't point the most powerfull pack with the IR measurment, only a dying one.
the charging curve seems to be more revealing of it.
(in my case, the goal is 5mn without lost of power)
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