Power heltec v3 with NIMH batteries?

Is it possible to power the heltec v3 with NIMH batteries? Like maybe 4 in series (4.8v) or 3 in series (3.6v)?

Would it even charge them or is the charging only for li-ion battery packs like the 3.7v one that everyone suggests?

I don't want to buy it if I don't need it, I have old NIMH batteries in abundance and I'm not sure what my final setup should look like yet.

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My guess is that you could power the board, but charging will end in disaster.

Nimh isn't as energy dense as li-ion as I recall? So an 18650 is probably a better bet.
- Yeah my plan was without charging. But I found another solution anyways :)

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