Apple iPad battery remaining life
How do you determine battery health on an iPad.
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Apple can find that out through a check of the diagnostic data. I've had that done a few times on different iPad models. It can also be done remotely.
There are some tools that can dig in and display the numbers including estimated battery health and the number of recorded cycles. I personally use coconutBattery for Mac (they call it "Design Capacity"), but some recommend iMazing which I believe is for PCs.