A barrel plug charger is a power adapter or cable that ends in a cylindrical DC connector to deliver low‑voltage power to electronics. You’ll see these on devices like small cameras, routers, LED strips, and more.

• Plug size: Measured by outer diameter × inner pin (e.g., 5.5×2.1mm, 5.5×2.5mm, 4.0×1.7mm).
• Voltage & current: Must match your device’s requirements.
• Polarity: Many devices use center‑positive, but always check the label.

On this page, you’ll find standalone power supplies, USB/USB‑C to barrel cables, and tip adapters. Matching size, voltage, current, and polarity can help reduce compatibility issues.

Start by checking your device’s power label or manual. Many list the barrel size (e.g., 5.5×2.1mm), along with voltage, current, and polarity. If it’s not printed, look near the jack for markings.

• Common sizes: 5.5×2.1mm, 5.5×2.5mm, 4.0×1.7mm, 3.5×1.35mm, 2.5×0.7mm.
• Measure if needed: Use calipers to check outer and inner diameters.
• Fit matters: A plug that’s close but not exact may feel loose or too tight.

If you’re unsure, multi‑tip kits and screw‑terminal adapters on this page can offer flexibility, but always confirm voltage and polarity before powering up.

You’re looking for two numbers: the outer diameter (OD) and inner pin diameter (ID). Accuracy helps avoid a wobbly fit or no connection.

1. Power down first: Disconnect the adapter and device.
2. Measure OD and ID: Use a caliper or check manufacturer specs; common sizes include 5.5×2.1mm and 5.5×2.5mm.
3. Check length and polarity: Some jacks need a longer plug; verify center‑positive vs. center‑negative on the device label.
4. Test gently: Don’t force a plug that doesn’t slide in smoothly.

Multi‑connector tip sets found on this page can help you identify a match, but always confirm your device’s voltage and current needs before use.

Barrel plugs vary in several ways, and the right match supports a reliable connection.

• Size: Outer and inner diameters (e.g., 5.5×2.1mm vs. 5.5×2.5mm) plus plug length.
• Polarity: Many devices are center‑positive, but some are center‑negative; verify on the label.
• Current/voltage: The adapter and cable should be rated to meet the device’s power needs.
• Use case: Some “barrel” couplers on this page are RF or audio connectors (e.g., BNC, N‑type) and aren’t DC power plugs.

Confirming size, polarity, and power requirements before buying can help avoid mismatches and reduce wear on the jack.

USB and USB‑C barrel adapters can be convenient, but compatibility depends on your device’s power needs and the adapter’s capabilities.

• Match voltage: Many USB‑A adapters supply 5V only. Some USB‑C units negotiate higher voltages via Power Delivery, but only if the adapter and charger support it.
• Check current: Ensure the source can provide enough amperage for your device.
• Verify polarity and size: Use the correct barrel size and match center‑positive/negative.
• Read labels: Confirm output specs on the adapter and input specs on your device.

Walmart offers a range of USB‑to‑DC and USB‑C‑to‑DC options; many items are available for pickup or delivery for added convenience.