It will not charge with a peak-detecting charger since the HFP-10 is unfortunately diode protected, just like the Hitec transmitters. In my opinion, this is a dumb, antiquated design, but I deal with it by charging it with a "dumb" charger like an Accucycle or similar which charge at C/10 rates.

If I am in a hurry, I unscrew the end panel and remove the battery to fast charge the battery removed from the programmer. I replaced the 600 mah battery with a 2000mah NiMH to improve my run time with it.