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Min voltage for DHT22 is 3V, so you will need step up regulator when battery voltage drops. If you have low power sensor in mind it's better use suitable temperature/humidity sensor like HTU21D or SHT21. I've created custom sensor boards with this sensor and it can easily operate couple of years on 2 AA batteries.
farconada wrote: Hello
what's the best way to power an Arduino Pro Mini 3.3V with batteries connected to nrf24l01 + DHT22? 2xAAA or 18650
Thanks in advance, may be my question is a bit stupid but I'm new on electronics