Will it run on 3v by itself?

Yea it will. Ive hooked them up to multiple voltages. 3v they will run slow and quiet.

Are there any instructions for programming the raspberry pi to control the fans?

The fans are always on if hooked up to GPIO pins for power. You can use either 5 v or 3.3v. I use 5 v connection. I do not know of a way to turn them on/off with software.

Can these fan run on a 9v battery? Or 3, 1.5v batteries?

I use them with my Raspberry Pi boards. They have 3.3 volt and 5 volt pins. The fan runs faster with 5 than 3.3 volts but it is a little quieter when powered with 3.3 volts. They should run just fine on 4.5 volts, 3 drycells in series. I don't think I would put 9 volts on them but they are pretty cheap you could just try it and see if it gets hot or burns up.

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Easycargo Raspberry Pi 4 Fan 30x30x7mm, Raspberry Pi Cooling Fan Brushless 3.3-5VDC Quiet Fan for Raspberry Pi 4, Pi 3B+, RetroFlag NESPI Case (30mmx30mmx7mm) (Black (4-Pack))

Easycargo Raspberry Pi 4 Fan 30x30x7mm, Raspberry Pi Cooling Fan Brushless 3.3-5VDC Quiet Fan for Raspberry Pi 4, Pi 3B+, RetroFlag NESPI Case (30mmx30mmx7mm) (Black (4-Pack))

Product ID: 93412917

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Details

Product dimensions
30L x 7W x 30H
Brand
Easycargo
Power connector type
2-Pin
Voltage
3.3 Volts
Wattage
600
Cooling method
Air

⏳Long life (30,000 hours)

💨Airflow: 1.79CFM

🔇Low noise (15.92dBA)

Description

🌬️ Keep Your Cool with Easycargo!

COMPACT DESIGN - Perfectly sized at 30x30x7mm to fit snugly in your Raspberry Pi setup.
DUAL SPEED FLEXIBILITY - Easily switch between 3.3V and 5V for optimal cooling.
VERSATILE COMPATIBILITY - Ideal for Raspberry Pi 4, Pi 3B+, and various robotic projects.
LONG LASTING RELIABILITY - Enjoy peace of mind with a lifespan of up to 30,000 hours.
WHISPER QUIET PERFORMANCE - Experience near-silent operation with just 15.92dBA.

The Easycargo Raspberry Pi 4 Fan is a compact, brushless cooling solution designed for Raspberry Pi 4 and Pi 3B+ models. With a low noise level of 15.92dBA and a long lifespan of 30,000 hours, this fan ensures efficient cooling without disturbing your environment. Its dual-speed mode and versatile compatibility make it an essential accessory for any tech enthusiast or developer.

Specifications

Manufacturer	Easycargo
Part number	ES-F04RPI3010
Item Weight	5 g
Product Dimensions	3 x 3 x 0.75 cm; 5 g
Colour	Black (4-Set)
Material	Copper
Item thickness	7.5 Millimetres
Power source type	Dc 3.3v - 5v
Voltage	3.3 Volts
Wattage	600 milliamp_hours
Noise Level	15.92 dB
Special Features	Low noise, Long-life
Batteries included?	No
Batteries Required?	No

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