What it means — Apple
These alerts can appear for a few reasons:
Your iOS device might have a dirty or damaged charging port
Your charging accessory might be defective or damaged
Your USB charger might not be designed to charge devices
What to do — Apple
- 1 Connect your device directly to the charger, without any adapters or other equipment between your device and the charging accessory.
- 2 Remove any debris from the charging port on the bottom of your device.
- 3 Restart your iPhone or restart your iPod touch.
- 4 Try a different USB cable or charger.
- 5 Make sure that you have the latest version of iOS.
Read the full article for pictures and model-specific details: If your iPhone or iPod touch won't charge ↗