Low power servo button pusher

https://www.espruino.com/Servo+Motors

Hi all!

I've got a towel radiator which has a unit where you can press a button to turn it on an off. I'd like to use a micro servo to hit the on and off switch (by different rotations).

Since this in the bathroom, I don't have access to any power, would it be possible to run this on batteries? Are there any tips on ensuring the power doesn't drain too fast?

The article above mentions a hardware timer but I couldnt find any on the site.

Any help would be much appreciated

Thanks