How to check USB-C power delivery on Android

Your Android phone charges slowly, or you are not sure whether a USB-C charger is using fast charging. A browser test can compare how quickly the battery percentage rises with different chargers and cables. It cannot show the exact power level or confirm which charging protocol the phone negotiated.

Use the Charger & Cable Test to compare charge rates on the same phone. The result is a practical check of charging behavior, not a measurement in watts.

Compare the charger and cable

1. Open the Charger & Cable Test on your Android phone. If the tool is unavailable, your browser may not be reporting the phone's battery information.
2. Connect the first charger and cable directly to a wall outlet and the phone. Wait for Android to show that the phone is charging.
3. Keep the phone in similar conditions for each comparison. Start around 20 to 50 percent charge, keep the screen off, and avoid using demanding apps while the rate is measured.
4. Note the displayed charging rate in percent per minute. Repeat with another cable or charger, changing one item at a time. Compare tests that start at roughly the same battery level.

Charging can slow as the battery fills, and the phone may update its percentage in jumps. Give each setup enough time for the reading to settle. Do not compare a test near 20 percent with one near 90 percent and treat the difference as proof that a charger is faulty.

What the result means

The phone charges faster with one setup

The phone gained battery percentage more quickly during that test. The charger, cable, phone temperature, or the phone's current charge level may explain the difference. Repeat the comparison under similar conditions before deciding that one charger is consistently faster.

The rate is slow with every charger

That does not automatically mean the phone or charger is broken. The phone may be warm, running apps, or near a high charge level. It may also be limiting the rate because the charger or cable does not support a charging mode the phone can use.

The test does not show a rate or battery status

Some Android browsers do not provide battery information to websites. A missing reading is a browser or device limitation, not evidence that the USB-C connection has failed. Check the charging indicator in Android and try a supported browser if you want to see whether the tool can read the battery there.

Android says fast charging, but the test rate looks modest

The phone's charging message and a browser's percentage-per-minute estimate describe different things. Battery percentage is rounded, and its increase does not reveal the exact current or voltage. A browser test cannot confirm a USB Power Delivery negotiation or identify the charging protocol in use.

How to check the setup

1. Check the charger label. Look for USB Power Delivery or USB-PD and the listed output profiles. A USB-C plug alone does not guarantee USB-PD support, and a charger's maximum rating does not mean the phone will draw that much power.
2. Try a known compatible cable. Use a cable in good condition that supports the charging rate you expect. If you are comparing setups, keep the charger and phone the same while swapping only the cable.
3. Check Android's charging status. Look at the lock screen or open Settings › Battery. Menu names and fast-charging details vary by phone maker, so check the manufacturer's instructions if you are looking for a specific charging option.
4. Let the phone cool down. Heat can make a phone reduce charging speed. Remove a thick case if the phone feels warm, stop intensive apps, and retest after it has cooled naturally. Do not put a hot phone in a refrigerator or freezer.
5. Inspect the USB-C port. Check for lint or damage without inserting metal tools. If the plug feels loose or charging changes when the cable moves, stop using that connection and arrange a safe inspection.
6. Try another outlet. Connect the charger directly to a wall outlet for the comparison. A computer port, hub, or power strip with a switch may provide a different charging experience.

When the phone, cable, or charger may be faulty

Test a compatible charger and cable that work with another device, then test your phone with a second known-good setup. If the phone repeatedly disconnects, charges only when the cable is held at an angle, or stays slow after it cools, the port, cable, charger, or battery may need attention. Do not keep using a frayed cable, a damaged connector, or a charger that becomes unusually hot. Contact the phone maker or a repair shop if the problem follows the phone across reliable charging setups.

What this test can tell you about USB Power Delivery

USB Power Delivery is a charging standard that lets a compatible charger and device agree on a power level. The cable also matters, and some Android phones use other fast-charging systems or combine their own charging features with USB-C. The Charger & Cable Test observes the battery's reported charging state and rate. It does not read the electrical negotiation between the charger and phone, measure watts, or certify that a charger meets a standard.

Use the rate to compare setups on your own phone. For exact protocol details, check the phone and charger specifications from their manufacturers.