Mr T., I understand what you are saying. Having a diode in the circuit can interfere with peak detection. This also raises the measurement of the peak voltage. This is all true. But, in this case, I don't want to remove the diode (too easy to get the polarity incorrect).

Virtually everything I have has no diode or includes a polyswitch. I charge these packs with my Litco.

For diode protected packs, I use my Victor Engineering. The Victor charges at a constant current throughout the charging cycle (it also senses the pack voltage while the diode is forward biased). This means that the current though the diode is constant (so the voltage across the diode remains relatively constant). I get consistent peak detection using this charger with diode protected systems (particularly with Sanyo cells) - but not with the Hitec programmer.

Moses