I just bought a Doorbell 2 refurbished (though the packaging looked brand new) from Amazon and installed it. I initially charged the battery for about three hours (the light turned green in less than an hour), put it in the unit and let it sit outside overnight while I explored its features.
The next morning I noticed the battery was at just 67%, and also noted that the manual said to charge it for 5-10 hours, so I charged it for nearly seven hours while I installed the doorbell, which took a lot less than seven hours! Then I installed the battery, which reported that it was at 97%. I then had to leave the property, which is a second home. The next morning, the battery was back at 67%, with ten false motion alarms. I dialed motion sensitivity down to minimum and disabled one of the motion zones. I also set frequency to “light”.
That night, with no further motion events, the battery was at 37%! At that point I disabled motion sensing and live vew entirely. A day later it is still reporting 37%. This doorbell is located in Flagstaff, Arizona where the low temperature was 19 degrees last night. Overnight lows close to zero are not unusual in the winter. I read that low temperatures can impact battery life, but this seems ridiculous. Is this device going to be usable in this environment?
I went with the Doorbell 2 over the Pro specifically for the battery because there is no existing wiring in this location. With the advertised 6-12 month battery life I was not concerned because I’m usually at the property every 4-6 weeks at most. Unfortunately I won’t have an opportunity to recharge the battery for a few weeks, which is why I disabled motion and live just to hopefully retain some use of the doorbell. Maybe the cold weather also causes the battery level reporting to be wildly innacurate. Does anyone have experience with these in cold weather?