Most receivers will work down to about 4.8v.
It's below 4.8v the problems will occur (some of the budget rx's might be more prone than the more expensive ones).
For 12th we did not need an rx pack when using 4-cell nimh so Life at 6.6v will be fine for the radio.
Now we have 1s lipo we need an rx pack, and many actually use a small life pack...
I know the voltage is different but when losing 1v due to the nimh/1s lipo change we generally dropped one wind (5.5t to 4.5t) to keep roughly the same feel. In fact it would normally bequicker due to the better discharge band of a lipo.
I know this is working on lower voltages but I doubt the current draw would be enough to start causing issues for the receiver
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