stuck on charging apple pencil

There's a third one now as well - the USB-C Pencil. Looks like the flat one, but it doesn't charge on the magnet at all, you slide the end open and plug a cable in. Lots of people stick it on the side and wait forever. And if it's the round original with a newer iPad that only has USB-C, it needs the little adapter to charge.

which one is it, the round one with the cap or the flat-sided one? they charge in completely different ways. the flat one clips magnetically onto the edge of the ipad that has the strip, and only on models built for it. if it sticks but the battery doesn't move, it's nearly always a thick case holding it a couple of mm off the surface, or bluetooth switched off. the round one you pull the cap off and plug straight into the charging port.