Yup, and if voltage sags in the cold (-30c), this happens. Volts down, amps up. The dc-dc boost converter didnt like the abuse. That's part of the reason I'm switching to NiCd batteries, and Li-Ion batteries freak me out unattended in a forest, because of fire risk, abused from charging in the cold too...
I removed the blown converter and it still works when powering the base board and transmitter board individually, so using it with 5v external now.
