Charge the RX pack under .5 amps and you should be fine. I'm not familiar with that charger so I don't know if its capable of charging Nimh batteries. Even if it isn't rated for Nimh, you can charge at a low rate. I have charged mine at .25 amps and it works fine. Have you thought about getting a small trickle charger? You can get one for under $20 that will charge both overnight withno worries about overcharging.