Which plug is the 12v input and which plug is the 5v output?

There are arrows on the unit pointing to the flow of electricity. The arrow is pointing in the direction of the device that gets 5v

Can I swap ends of this without issue? I need the female end to plug a fan into and the male end to receive power.

No, you can not. The arrow on the covering shows the flow of power. The arrow points to the device being powered.

Would this work with a 12 V 9Ah battery?

Probably not, the voltage is at the bottom end of the manufactures specs but because you have a lot of amps, you’ll be able to hold the voltage, even though low, for some time. For the price, I think it’s worth the chance.

Could I use these to power a 5v rc fan with an adapter off a 3s balance lead?

If you are talking about the lead that is used to charge the battery then that is not a wise idea. You should use the power leads instead. The BEC steps down the voltage to 5v. Check to make sure the current matches close to the fan. Another possible option is the use the BEC to power the receiver and then use the receiver to power the fan similar to how you would power a servo. If you do that then you should disable the BEC on your ESC

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2 Pack ShareGoo 3A 5V DC-DC Converter Step Down UBEC Module for RC Quadcopter Plane FPV Holder Camera Servo Power Supply

Product ID: 73233260

Details

Amperage
3 A
Brand
Share Goo
Color
Black
Compatible Devices
Cameras
Connector Type
USB Type A
Included Components
2 X 5V FPV

⚡3A constant output current

💧Waterproof epoxy sealed housing

🔋Wide 5.5V-26V input range

₪63

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Description

🚀 Power your FPV gear like a pro—no burnout, no limits!

COMPACT LIGHTWEIGHT - Weighs just 6g and fits in tight spaces—perfect for portable, high-performance drone setups.
RUGGED WATERPROOF DESIGN - Epoxy sealed casing protects against moisture and dust for all-weather reliability.
RELIABLE 3 A POWER DELIVERY - Ensures stable 5V output for FPV cameras and servos without burnout risks.
SMART PROTECTION CIRCUITRY - Built-in overload, over-current, and voltage safeguards with auto recovery keep your gear safe.
UNIVERSAL BATTERY COMPATIBILITY - Supports 2-6 cell Li-Po packs (5.5V-26V input) for versatile RC applications.

The ShareGoo 2 Pack 3A 5V DC-DC UBEC modules convert 5.5V-26V input from 2-6 cell Li-Po batteries into a stable 5V output at 3A, ideal for powering FPV cameras, servos, and brushless gimbals in RC planes and drones. Featuring waterproof epoxy-sealed housings and comprehensive protection circuits, these compact, lightweight converters ensure reliable, safe power delivery in demanding aerial environments.

Specifications

ASIN	B07DYXTX9H
Amperage	3 A
Best Sellers Rank	#80,614 in Toys & Games ( See Top 100 in Toys & Games ) #34 in Radio Control Vehicle Speed Controls
Brand	Share Goo
Built-In Media	2 X 5V FPV UBEC
Color	Black
Compatible Devices	Cameras
Compatible Phone Models	Universally compatible with most modern smartphones using a separate cable (USB-C, Lightning, micro-USB) [except for models requiring higher than 5V/3A or proprietary charging standards]
Compatible Power Plug Type	Type A - 2 pin (North American)
Connectivity Technology	DC Barrel
Connector Type	USB Type A
Current	DC
Current Rating	3 A
Customer Reviews	4.5 4.5 out of 5 stars (200)
Enclosure Material	Plastic
Form Factor	Compact
Input Voltage	26 volts
Item Weight	1.44 ounces
Main Power Connector Type	2 Pin
Manufacturer	ShareGoo
Mfr Part Number	CS850-2
Model Number	CS850-2
Mounting Type	Travel/Portable
Number of Items	2
Output Current	3 A
Output Voltage	5 volts
Plug Type	no_plug
Power Plug	No Plug
Power Source	Corded Electric
Special Features	Lightweight Design
UPC	763846887340 763846883908
Unit Count	1 Count
Wattage	1 watts
Wired Charging Connector Type	USB Type A

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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₪63

Duties & taxes included

In stock

Sold byAmazon IsraelDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Israel.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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