I've done this to my Futaba 2PL-FM but I have to bypass the diode inside. One problem with this is that you cannot charge at rates higher than 1 amp or the batteries will overheat or false peak (I am using Duracell/Energizer 2500's) on my 0610iNET. I just slow-charge it with my trusty Tekin 112 at 200-250mah.