It will be the wifi on the ESP killing the battery, not the epaper display.
Heya! Just started out with E paper displays and bought 2x 2.9’’ displays.
I’m trying to get this working on my 2.9’’ display:
And I have been following the guide to the point where I should copy the code to the final automation. The code is in “automation.yaml” but copying it straight wont work! It feels like the code might be outdated compared to how HA take the code in today (its some months old).
And even if I just copy the code straight to a new automation I get the error code "Error: Error rendering data template: TypeError: ‘>’ not supported between instances of ‘NoneType’ and ‘int’ "
What is wrong? Could anyone help out? 
Thanks!
Does this help you?
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Actually first I failed in setting up the Weatherman-sensor. And then I put the font-file in the wrong media folder. Now it all works Thanks!
I am fighting this error for quite some time now. Mind sharing what you did where?
I put the fonts in the first media folder. And in the automation I changed to this at the font in the code:
font: /media/fonts/GothamRnd-Bold.ttf
and then it worked!