RE: Ernst Charge Receptacle...?
I just had the SAME issue with the futaba J charge receptacles from ERNST. I actually bought 2 thinking one was bad. Just like Ponda, there was no space (even before mounting) to allow the J plug from my voltmeter to seat with the female connector from the battery. The interesting thing is, although it was a tight fit, I could get the wall-wart charger plug into it. I bought one of the Expert Electronics Charge Receptacles (Advantage has them as did a LHS) and it worked like a charm. The only catch is that these do not come withthe rubber plug that the ERNST does but I just moved it from the ERNST.