Remove Your Apple Pencil
If you’re not going to use it, you might want to disconnect your Apple Pencil from the top of your iPad. If your Apple Pencil is also low on battery, it’s going to start charging whenever you connect it back to your iPad, reducing your iPad’s battery a little bit faster.
Sure it might not be that demanding, but if you need your battery to last longer, and you aren’t really using your Apple Pencil, this is a quick fix you could try.