Originally Posted by
Cfe7
The Led status you decribe is correct.
It didn't help to move away from all noise sources in the house, so now I'm charging the RX battery.
3.9 V was maybe to low for this kind of RX - or should I instead plug in a 2 cell LiPo directly?
3.9 volts is very low. You can plug a 2S lipo in as long as any connected servos can handle that voltage.