iOS 11.3 brings iPhone Battery Health (Beta). This new feature made available in this update provides users with info about the health of their battery, allowing them to determine if the condition of their battery is affecting their iPhone's performance.
- Displays information on iPhone maximum battery capacity and peak performance capability
- Indicates if the performance management feature that dynamically manages maximum performance to prevent unexpected shutdowns is on and includes the option to disable it
- Recommends if a battery needs to be replaced
Go to Settings → Battery → Battery Health (Beta). If your battery is functioning correctly, you will see the left message. If not, you will see the right message and you can tap Disable to disable the performance management.
You can read more about this feature in the Apple KB article
Without updating to iOS 11.3, you can still determine battery health.
If you don't have one of these devices with at least this version of iOS, your device is not being slowed regardless of the state of the battery, unless you've enabled Low Power Mode either manually or when the battery reaches 20% (and disables at 80%).
- iPhone 6, iPhone 6s, iPhone SE with iOS 10.2.1
- iPhone 7 with iOS 11.2
If you have one of these devices, you can check if your battery is poor using an app:
To know more accurately, you can run the Geekbench benchmark.
Make sure Low Power Mode is disabled, then run the Geekbench benchmark (not the battery benchmark, that's for analysing your battery itself and not its effect on iOS) and note your score. If it's more than 500 points less than the expected number (given below), then this indicates a potential problem.
- iPhone 6s: 2500
- iPhone 7: 3500
iPads do need more current than iPhones, they have bigger batteries, and bigger screens. They consume more power because of this. If you aren't using a charger (block) of the same or higher capacity than the one included with your iPad. Considering this is a Pro model we're talking about, it'll probably have to be a higher voltage charger than a regular iPad charging brick. If you ARE using the charger included with your iPad Pro, consider getting it replaced. It may have given out from a power surge, or just worn out from constant use.
Temporarily, however, you can power off your iPad while charging. I've had a similar problem to this with my Samsung Tab A 7.0, and powering it off allows it to charge. It will probably still charge slow, but it won't lose battery life, and will charge significantly faster than with it powered on.
Best Answer
According to Apples Information the iPads should not be affected.
Apple Support Document:
So the feature (or issue as some see it) is not present on the iPad. The iPad under the circumstances that the battery can't deliver the necessary power would shut down and not try to throttle performance.