it probably is the touchscreen that uses lots of energy..
If there was a way to completely turn that one down, but then you'd be swapping the pen in and out all the time.
You kind of need a button,that unless holding the tablet with the button pressed, the touchscreen would not be activated.
A press button for quick touches, and it'd be awesome if you could click that button in a hold position for longer duration of time.
I bet that way you'll be able to at least double the batterylife from what it is now!
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