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I use my iPad on my desk with a stand everyday and it is connected to usb cable, which also charges iPad. It usually stays at 100% charge since my cable is connected.

In this case...does my iPad still use the battery? Does it still decrease lifespan of my iPad battery?

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No, the battery is not used once it is fully charged.

However, the battery life is getting depleted. Keeping the battery charged at 100% keeps it at a high voltage, and this voltage is detrimental to the life of the battery. This is the reason that Apple introduced an option to "Smart-charge" the battery to a lower percentage (80% is Apple's standard, but industry-wide 40% is a better choice).

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  • Why is 40% better than 80%?
    – mmmmmm
    Nov 30, 2022 at 12:57
  • Because it's closer to 50% - Apple obviously chose 80% because people would be frustrated if their device didn't charge beyond 40% lol, and 80% achieves most of the same benefits
    – Ezekiel
    Nov 30, 2022 at 14:39
  • Why the down-vote?
    – Alex
    Dec 11, 2022 at 4:09

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