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Wacom pens do need power, it's just it's from the host, not a battery. A Wacom EMR without Bluetooth won't have a battery. Similarly an MS Surface / Kobo pen (incompatible with Scribe) can have BT for "One Note" and often needs a second battery, but the Kobo, like the Scribe, doesn't use BT functions in a pen and it's optional even on MS Surface.
There are a few pens that do MS/Kobo protocol and ALSO Wacom EMR.
Apple of course uses a different system, but there are good cheap 3rd party Pencils.
There are at least two Wacom systems that are incompatible. Older serial/USB sketching pads, tablets and laptop screens use the original Wacom, not Wacom EMR. Both kinds of Wacom I've used do seem to come in variable numbers of buttons and the original top "eraser" was simply a broader tip pressure sensitive input (on the pad) that could have an erase function, not a user button.
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