How to connect 4volt rechargeable battery to arduino uno? or how to amplify the battery voltage before connecting it to arduino uno?

Other Hardware Motors, Mechanics, Power and CNC
1

Can we use 4volt battery to arduino uno?
if not how to amplify this voltage before connecting to arduino

2

No.
Use a buck boozter to make 5 volt.

3

The safest way to do it is to boost the voltage to 9V and power the UNO through the barrel jack.

4

can we use a mosfet transistor?

5

can we use a mosfet transistor?

No.

6

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