The bug probably affect the Nest&#x27;s ability to do low power charging using the fan wire. Evidently, as long as the fan runs, the Nest will charge at a lower rate than you get with the common wire hooked up. That is, unless you release some bad code and didn&#x27;t do a full CI&#x2F;CD run on a test unit and wait 2 weeks for the battery to go dead to figure out there was a bug.<p>Which hit me on the 8th at exactly 9:29AM. It was FREEZING in the house. Dead nest. Took me about 10 minutes to look up the issue and 5 to hook up common.<p>Any code that touches battery or recharge methods should throw a red flag immediately and have a 1 month wait time slapped on them. Also, there should be a dedicated Test Nest for each release known to be &quot;in production&quot;.