I got a 4 battery holder (4-Way 18650 Battery Holder from Dfrobot) And I'm wondering do I need a resistor to power the rasbery pi via gpio 5v pin. Or do I need something else for this power supply The idea circuit is 5v-resistor-relay-rasberry pi
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You can't "power the rasbery(sic) pi via gpio".
It IS possible to power via the 5V & Gnd pins on the expansion header.
You NEED a regulator which supplies 5V ± 0.25V and ideally protected by an ideal diode.
See Can the Pi be powered through the expansion header? in Raspberry Pi Power Limitations
Putting a resistor in the circuit will cause the voltage to fall below the minimum.
Sourcing a suitable regulator is fraught with challenges - many Pi have been destroyed by unsuitable regulators.
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