No. Mine has been great. I use the stock most of the time and it's been holding up pretty well. I've only had it for a few months though.
I'd be more interested in dropping the 13.8 down to 10 and powering the RD.
The 6 pin is hot. I've wondered about stepping it down to 10volts to power the mic instead messing with a 9 volt battery. It would have to be done in the mic so you could still use the stock mic as well.
I was looking to buy one of these radios. Now that I see all of the hell you guys are having glad I did not get one....
Here it is. If you run the radio on a regulated power supply then all you need is a few diodes to step down the voltage. Each diode steps the voltage down .6 volts. You might have to run a ground wire as well to cut down on a chance noise entering (ground loop)the audio stream.
Now, can the circuit supplying the voltage to pin 6 handle the load...
Love to modify, hate to fix!
I was thinking about tapping in at where power comes on the radio. Also a small capacitor bank where the battery currently resides(ala' K40). That's as far as I know. The smart ones on this forum may pitch in with their ideas. Also,I'm wondering if the power and ground leads from the mic jack to the tap in should be shielded coax.
Microphone Mobile Astatic 6 Wire Cord
Better: https://www.gijoesradioelectronics.com/scripts/prodView.asp?idproduct=1236
Got an idea for you
First question, is pin 6 12v?
If so....
Get a LM7808 voltage regulator (cheap as chips) and mount it inside the road devel mic. This will step 12v down to 8v which the mic amp circuit will run on. Assuming that the supply from pin 6 has enough current carrying capacity to run the mic. I have done this on several different mics, the current mic being a kenwood mc80 desk mic. Give it a go and at worst just connect a jumper from pin 6 to bat+ to give you the current capacity