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If your iPad seems to be charging slowly, make sure you are using one of the two methods to ensure that the power source is sufficient to charge the device:
- Connect iPad to a power outlet using the included cable and USB power adapter (use the table below to determine which adapter is intended for your iPad.)
- Connect to a high-power USB 2.0 port using the included cable.
See the article below for more information that can help:
iPad is designed to charge with the USB power adapter provided in the box. iPad will charge with any Apple USB Power Adapter and will also charge, although more slowly, when attached to a computer with a high-power USB port. When attached to a computer through a standard USB port (most PCs or earlier Mac computers) iPad will charge, but only when it's in sleep mode. Make sure your computer is on while charging iPad through USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain.
iPad: Charging the battery