Slow charging is a math problem: watts in minus watts burned. A 5 W adapter on a big phone barely wins against the screen. Here's how to find where your watts go.
- 1Use the original or an adequate adapter, fast-charge phones on 5 W chargers charge at a crawl.
- 2Test another cable: cheap cables lose serious power, and worn ones negotiate slow modes.
- 3Clean the USB port (powered off, wooden pick).
- 4Charge with the screen off and close heavy apps, active use eats half the input.
- 5Avoid charging in hot places: heat forces the phone to slow charging to protect the battery.
- 6Computer USB-A ports deliver 2.5-7.5 W, always slower than a wall adapter.
Tip: Check your battery status live with our tool while trying different chargers, the estimated time to full reveals which setup is fastest.