Hi there,
Way to go… that is respectful Low power too. It’s not the lowest power Xiao but AOK. Good for sticking with it… With all this stuff it’s a process, not rocket science. You ask good questions , you get good answers.
Do us a solid and mark the post as the solution so other may find it fast. 
GL 
PJ 
Check out the Nrf52840 , it’s like a camel in the desert sipping power. 