Laptop battery won't charge
This is very common, and most of the time it's the cable, the outlet or a setting rather than a broken battery.
Be careful: If the charger or laptop gets very hot, smells of burning, or the battery looks swollen, unplug it right away, don't charge it, and get in-person help.
What to do
Pick your kind of computer:
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Step 1: Plug the charger straight into a wall outlet you know works, not a power strip.
Step 2: Check every part of the cable is pushed in firmly, including where it goes into the power box in the middle of the cable.
Step 3: Look for a charging light on the laptop. Try a different outlet if there's none.
Step 4: Look gently into the laptop's charging port with a flashlight. If there's lint, ask a helper to clear it with a wooden toothpick, never anything metal.
Step 5: Restart the laptop with the charger plugged in.
Step 6: If it says Plugged in, not charging at around 80%, your laptop maker's app may have a battery-saving limit turned on. Open the maker's app (for example Lenovo Vantage, HP Support Assistant, MyASUS or Dell's power app) and look for battery or charging settings.
Step 7: Install updates in Settings, then Windows Update, as battery and charging fixes often come this way.
Step 1: Plug the charger straight into a wall outlet you know works.
Step 2: Check the cable is firmly in at both ends. With MagSafe, check the light on the plug: amber means charging, green means full.
Step 3: Look gently into the port with a flashlight for lint, but don't poke anything metal in.
Step 4: If it says Not Charging or the battery stays at 80%, this may be on purpose. Your Mac pauses charging to protect the battery when Optimized Battery Charging is on.
Step 5: To charge fully now, click the battery icon at the top of the screen and choose Charge to Full Now if you see it.
Step 6: Shut the Mac down, wait 30 seconds, then turn it on with the charger plugged in.
Step 7: Check System Settings, then Battery, for any message about the battery needing service.
Step 1: Use the Chromebook's own charger and plug it straight into a wall outlet.
Step 2: Try the other USB-C port if your Chromebook has two.
Step 3: Check for a charging light near the port.
Step 4: Do a hard reset: turn it off, then hold the Refresh key (the circle arrow) and tap Power.
Step 5: Check for updates in Settings, then About ChromeOS.
Still stuck? If it still won't charge, try a known-good charger of the same type, then contact the maker's support or a trusted repair shop, as the battery or charger may need replacing.