If you really want to up your game – and fix all the issues you mention above – I recommend installing the WebCore app: https://community.webcore.co/
There’s a bit of a learning curve it getting it all running, but it will unleash the power of the Smartthings hub. You can easily write a piston to check the battery level of a Halo and notify you (via email, SMS, whatever) if it goes beneath a certain threshold, or SMS you if a Halo is triggered.
Foul