if its in a ko i have always had to reverse pins in the plug so that the live pin is the pin to the right not the centre as you plug it in to the radio this puts the negative is in the centre
most lipo packs with RX type plugs come with centre pin live this may have caused your failure if you were unaware
no intention of trying to be clever just a possible explanation
i have 5 ko helios currently all lipo 3s powered never had a problem
also if you switch on with aerial down (40 mhz) the tx module will get hot
if i remember correctly a long while ago in the good old days i knew of people who linked in a extra 9th cell to get extra oomph of tx power
regards fid
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