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Originally Posted by Nightyume
Last I checked Wacom has Wacom AES 1.0 and 2.0 which use powered pens. EMR doesn't use battery powered pens and is powered by the digitizer but it's not Wacom's only product.
And yes, I am somwhere warm and also with lots of tech, my desk has various devices with which I work and which it would not behoove me to scatter to the four winds in hopes of better battery life.
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OK, so 4 Wacom systems, two using local power. The Wacom pens without internal power are more common (1990s original and current EMR).
Thus there are maybe at least six powered pens/stylus for digitisers.
None are going to use up a battery in even 30 minutes, never mind 15. That's a faulty cell or pen. The Kobo/MS Surface MPP/N-Trig based pen for writing only (not using BT function if fitted) is 1500 hours of use on Alkaline AAAA and 6 months to a year standby. The cell is 5 to 10 year shelf line from manufacture if cool.
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I've had several different pens and all the good ones (tilt detection, higher pressure sensitivity, etc.) end up "dying" relatively quickly. If I screw the cap off and then screw it back on I can anywhere between 15 minutes to just 30 seconds.
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Either you bought rubbish expired battery cells, or have faulty pens, or you are mistaken.
Apple Pencil (rechargeable only) seems to be the worst for battery life.
Wacom quote about 6 months for an AAAA cell in AES and users claim a solid 8 hours writing is no problem. It's very similar to N-Trig/MPP, hence some screens and some pens support both Wacom AES and MS protocols. The first two generations of Surface used the incompatible Wacom stylus powered by the screen.
EDIT: Researched more on battery life.