iPad Battery
How long Does it take to charge a iPad 9 to 100% Battery?
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The time required to fully charge an iPad battery is influenced by many factors - such as the power-output of the Power Adapter used to charge the device, the ambient temperature and the current activities being performed by the iPad. An iPad that is otherwise not being actively used will have background processes running.
If charging your iPad in a cool environment with an Apple 20W USB-C Power Adapter, you might anticipate achieving a full recharge from almost exhausted to 100% in about 2.5 to 3 hours. When using a standard USB Type-A Power Adapter, charging will take longer. A Power Adapter rated higher than 20W will not result in faster charging.
Be aware that the iPad will appear to charge quite quickly to ~80% - after which the remaining 20% will be much slower. This is by design - and is intended to extend the useable lifespan of the battery.