Battery: Goes from 70% to 1% First Alert 2-in-1 Z-Wave Smoke Detector

[tgauchat (ActionTiles.com co-founder Terry @ActionTiles; GitHub: @cosmicpuppy)]

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First Alert Smoke & CO: Battery level report very wrong...?! CHIRP! CHIRP!

So I had one of my First Alert Z-Wave ZCOMBO Smoke & CO Detectors go into the dreaded (though not as bad as fire! ) “low battery chirping mode” this morning. Exactly one of the situations I was hoping to avoid by using a “smart” device. According to the “Recently” tab, at 8:15am the battery was reported to be 77% (history shows a drop from 79% to 78% over the last 6 days … seems perfectly normal). In other words: *there was apparently sufficient battery and connectivity to a rather more than sufficient battery capacity at 8:15am& … I’m not sure what time the chirping started though!). I took out the batteries and re-inserted. The device promptly reported battery level as 1%! Of course, if the device were a little smarter, then it should offer an additional speci…