How to compare charging cables before a photo shoot

Getting ready for an outdoor photography session? A slow or unreliable cable can leave your phone, tablet, or camera short on power when you need it. Comparing cables before you leave can help you choose the one that charges your device more consistently.

Use the Charger & Cable Test to compare charging rates on a device whose browser reports battery information. It measures how quickly the charge level rises, not the cable’s exact electrical output, so keep the test conditions as similar as you can.

Compare the cables under the same conditions

1. Open the Charger & Cable Test on the phone, tablet, or laptop you plan to rely on. Connect the first cable to the same charger or power bank you intend to take outside.
2. Check that the device reports that it is charging. Keep the screen and apps in a similar state for each comparison, and start with a charge level well below full. Charging usually slows as the battery approaches 100 percent.
3. Watch the test’s charging speed in percent per minute for a few minutes. Note the reading and any interruptions, then disconnect the cable.
4. Repeat with the second cable. Use the same device, power source, port, and approximate starting charge. If the results are close, repeat the comparison once more rather than choosing based on a single reading.

For a fair comparison, avoid using the device heavily during either test. Taking photos, streaming, or running navigation can use power as it comes in and make the charge rise more slowly.

What the results mean

One cable charges faster in repeated tests

That cable and the rest of the setup deliver a higher observed charging rate in those conditions. It may be the better choice for charging that device from that power source, but the result does not guarantee the same advantage with a different phone, charger, or camera.

The rates are close

The test may not show a meaningful difference, or the device may be limiting the rate. Choose the cable that is in good condition, fits securely, and is long enough for your setup. Do not assume a tiny change in percent per minute proves one cable is better.

The rate changes or charging stops

Battery charging is not perfectly steady. The device may adjust its rate as its battery warms or its charge level changes. A loose plug, a power bank with a low charge, or an active camera app can also interrupt charging. Repeat the comparison with the device resting and check whether the problem follows one particular cable.

The test cannot show a charging rate

The browser may not have battery information for that device, or the device may not be charging. The Battery Meter and Charger & Cable Test appear only when a device’s browser reports a battery. A browser test also cannot tell you a cable’s exact wattage, confirm its safety rating, or prove that it supports fast charging.

Fix a slow or unreliable result

1. Check the power source. Use the same known-working charger or power bank for both cables. If you are testing a power bank, charge it first, since its output can change as its battery runs low.
2. Reseat both ends. Disconnect and reconnect the cable firmly. Check for lint or damage around the device’s charging port, and do not force a plug that does not fit.
3. Test while the device is idle. Stop camera previews, navigation, and other demanding tasks during the comparison. Keep the screen off or at the same brightness for both runs.
4. Check whether the device reports charging. On Windows 11, look under Settings › System › Power & battery. On macOS, open System Settings › Battery. A phone or tablet’s charging display can confirm whether it recognizes a connection, though its menus vary by model.
5. Try another compatible port. Test the same cable and power source on a second port if available. A damaged port or a power bank port with limited output can make a good cable appear slow.
6. Retest with a compatible charger. Some devices need a charger and cable that support the same charging standard to reach their faster rates. Check the device maker’s requirements if neither cable performs as expected.

Check camera compatibility separately

A cable that charges your phone quickly is not automatically the right cable for a camera. Cameras vary in whether they support USB charging, which ports provide power, and which charging standards they accept. Check the camera’s manual or manufacturer’s specifications before relying on a USB cable to charge it during a shoot.

If you are comparing cables for a camera, the browser test cannot measure that camera’s charging rate directly unless the test runs on a device whose browser reports a battery. You can still check that each cable fits correctly, charges the camera according to its own display, and stays connected while gently repositioned. Do not bend or pull a connected cable sharply.

When to replace a cable

Stop using a cable with exposed wires, a split outer covering, a bent connector, or unusual heat. If charging cuts out when the cable moves, try it with another compatible device and power source. If the same fault follows the cable, replace it rather than taking it on a shoot. A charging-rate comparison is useful for choosing between working cables, but it is not an electrical safety inspection.

Run the comparison on your own device. The test measures its reported charging behavior, and it does not upload your photos or recordings.