I have chased IR for awhile, the hitec chargers are not the greatest for this as the numbers are not very repeatable,and it does without current running threw it.
Now I was using the ac pro (the one with the soldiering station) I now have a icharger which is alot more consistent.
Biggest facter for consistency I found was that you must have good leads and wires.

For true performance test was when I use a gfx turbo 35.
Those numbers that I got from that machine, reflected the performance on the track.