MKR1000 with 5v Battery


I wanna buy a nextion tft 2.8" to use with MKR1000. This screen use 5v of voltage and my question is, if is possible connect a 5v battery instead of 3.7v battery? I've seen datasheet schematic but i have not seen which the regulator. Someone can help me?



Nextion tft works well with 3.7 volts also.