Arduino Uno with HC-SR04 Power saving

Projects General Guidance
1

Hi guys!

My Arduino Uno is powered by 9v battery to run 2 ultrasonic sensors (HC-SR04) and a buzzer.

I intend let the circuit run for at least a week.

I
s there a solution to reduce power consumption / increase battery life?

I am open to hardware and software solutions.

Thanks!

2

Don't use a 9V battery, you're burning volts and money.

3

Use a rechargeable 5V power pack (sold for charging phones).

Steve