OK, so interrupt on battery power is a must. One possible deployment model for this device is to allow it to pull EN low turning off the Boron and the devices it is powering completely off. This is part of my goal to build a Boron device that can call in every hour (for at least 18 hours a day) and last on a single battery for one year. May take a couple steps to get there but ...
I will look at these two. Can you send a link to the Particle (?) library for the the MCP79410? I have shared my DS1339 project below and am working on getting the library ready to publish.
I want to make the best choice here so will look at this over the next day or so.
Thanks,
Chip