Some of the 1700mAh packs have high internal resistance... I've had bad luck with them. Were your voltage measurements under a 1 amp load or static (I don't trust static voltage measurements)? Did you discharge the rest of your RX pack after your crash to see how much was left in it? Try doing a vibration test on your switch and RX... put a small allen wrench in a moto tool and turn it on slow so that it vibrates. Touch it to your radio components one at a time while it is operating (including plugs and switches)... if there are any loose components they should show up with this test. I'm not to impressed with the JR "Heavy Duty" switches... they are kinda junk inside... easy for parts to come loose.