Symptoms
- Charging percentage climbs much slower than usual
- Phone stays warm while charging slowly
- Fast charging notification never appears
- Charges fine on one charger but slowly on another
Likely causes
- CommonCharger doesn't support the phone's fast-charging standardUsing a basic 5W adapter on a phone that supports 20W+ fast charging will always be slow.
- CommonCable can't carry enough currentA thin or damaged cable limits charging speed even with a good adapter.
- CommonPhone in heavy use while chargingUsing the phone, especially GPS or video, while charging can offset most of the incoming power.
- PossibleWireless charging alignment or pad qualityMisaligned wireless charging is much slower than a wired connection.
- Less commonCharging port or battery degradationAn aging battery can accept charge more slowly as a protective measure.
What to do
- Check your phone's specs for its supported fast-charging wattage and make sure your adapter meets or exceeds it.
- Use the cable that came with the phone or one explicitly rated for fast charging.
- Put the phone in airplane mode or turn off the screen while charging to speed things up.
- If using wireless charging, make sure the phone is centered exactly on the pad.
- Try a different wall outlet in case the outlet itself is underpowered.
- If charging is consistently slow across multiple chargers and cables, the battery or port may be aging.
Tools and parts
- Fast-charging wall adapter
- Manufacturer or fast-charge-rated cable
Fast charging wall adapterSearch: “USB-C fast charger 20W or higher”
When to call a pro
If charging stays slow with a confirmed matching charger and cable, a phone repair shop can test the battery and port.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.