How can I put the power reserve to 5% instead of 10% on the Apple Watch?

[iMore Question]

I would like to extend when my Apple Watch will power off when the battery gets low. How can I extend it from 10% to 5%?

 

[Just_Me_D]

I don't think you can.

 

[gilligan793]

As far and I can tell you can't. Just built in at 10%