Laptop plugged in but battery percentage not increasing

Your laptop is plugged in, but the battery percentage stays the same or even drops. That can mean the charger is too weak, the laptop is using power as quickly as it receives it, or charging has been paused to protect the battery.

Check the battery's reported charging state, then compare how quickly it gains charge with different cables and adapters. TooLab's Charger & Cable Test measures charging speed in percent per minute on devices whose browser reports battery information.

Check whether the battery is charging

1. Connect the charger directly to a wall outlet and to the laptop's charging port. Note whether the system says it is charging, not charging, or plugged in.
2. Open the Charger & Cable Test. Keep the laptop awake and let the test observe charging for several minutes. The test reports charge speed in percent per minute.
3. Open the Battery Meter to check the charge level, charging state, time left, and drain rate. Compare its reading with the system's battery indicator.
4. If you have another compatible charger and cable, test them in turn. Use the same laptop, outlet, and general workload for each comparison, and give each setup several minutes.

Some browsers do not provide battery information, so these tools may not be available on every laptop. If a test cannot read the battery, that alone does not point to a battery or charger fault.

What the result means

The percentage rises, but very slowly

The battery is receiving more power than the laptop is using, but not by much. A percentage display rounds the charge level, so a small gain may not show until enough energy has accumulated. A charger with lower output, an unsuitable cable, or demanding work can also make charging slow.

The system says charging, but the percentage is unchanged

The laptop may be adding power too slowly for the rounded percentage to change yet. It may also be using most of the incoming power to run the screen, processor, and other components. Give it 15 to 20 minutes with demanding apps closed, then check again.

The battery says not charging or the level stops near the same point

Many laptops pause charging at a chosen limit to reduce battery wear. A battery that is very hot or cold may also charge slowly or pause. Check the laptop maker's charging or battery-care settings before assuming the adapter has failed.

The reading changes with another charger or cable

The original charger, cable, outlet, or charging port may be limiting the power reaching the laptop. USB-C plugs can look alike, but not every cable or port supports the power level your laptop needs. Use a charger and cable rated for that laptop.

No setup increases the charge, or the level keeps falling

If the laptop is idle and cool, and it still loses charge with a compatible charger, the problem may be the charging port, adapter, battery, or internal charging circuit. The test compares charging behavior, but it cannot identify which physical part has failed.

How to fix it

1. Give the laptop time to update the reading. Leave it connected for at least 15 minutes, especially if the battery is nearly full. A small change may not be large enough to alter the displayed whole-number percentage.
2. Reduce power use while testing. Close games, video editors, and other demanding apps, lower screen brightness, and let the laptop sit idle. If the battery gains charge while idle but not during heavy use, the charger may be supplying less power than the laptop is consuming.
3. Check the outlet and connections. Try a different wall outlet, unplug and reconnect both ends of the cable, and look for debris or damage around the port. Avoid forcing a connector or using a cable with exposed wires.
4. Use a suitable charger and cable. Check the laptop maker's recommended wattage and use a compatible adapter. For USB-C charging, use a port that supports charging and a cable rated for the required power. A phone charger may fit but provide too little power.
5. Check the charge limit and battery settings. On Windows 11, open Settings › System › Power & battery, then look for charging information and any charge-limit option provided by the laptop maker's app. On a Mac, open System Settings › Battery and check the charging status and battery health settings. The exact options vary by model.
6. Let the laptop return to a normal temperature. If it is hot, shut down demanding work and place it on a hard surface with its vents clear. If it is unusually cold, move it to a room-temperature location and let it warm gradually. Do not heat it with a heater or hair dryer.
7. Restart, then test again. A restart can clear a temporary reporting or power-management problem. After it starts, connect the charger and compare the reported state and charge speed again.

When it may be a hardware problem

Try the laptop with a known-good charger and cable that meet its requirements. If the charge still falls while the laptop is idle, or the connector only works at a particular angle, stop using damaged equipment and arrange a repair. A loose charging port, worn battery, or failed internal charging component needs service.

If the laptop is under warranty, contact the manufacturer before opening it or replacing the battery yourself. If the battery is swollen, the case is lifting, or you notice a chemical smell, unplug the laptop if safe and get professional help. Do not press on or puncture a swollen battery.

Why a charger can be connected without charging the battery

“Plugged in” only means the computer detects an external power source. It does not guarantee that the battery is gaining energy. The laptop divides available power between running the computer and charging the battery. If the adapter is underpowered or the laptop is busy, charging can slow to a stop while the computer continues to run.

Charge speed also changes with battery level and temperature. Near full, a battery normally charges more slowly, and a built-in charge limit may hold it below 100 percent. Compare chargers at a similar battery level and with similar apps open for a fair test.

The battery tests read charge information reported by your device in the browser. They do not install software.