Sounds like your MM has issues. Get down to you LHS and pick up a set of Futaba-charging leads for TX and RX, and an ESV(Expanded Scale Voltmeter). An ESV will put a load on the battery pack, abeit TX or RX. This will give you a real world voltage, much like it is when you are loading the batteries in your TX and RX. There can be a fairly severe drop in available voltage, when a load is being applied. Its also a good way to see if you have a battery going south. If it starts to show lower voltage consecutively after full 15 hour charges.,,,,,Cya tommorow