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All,
FYI - My current status update of Nitecore, Eastshine and Eagletac batteries in cameras ranging from ~5.4 minutes to ~0.0 minutes of recording per day. All cameras are on highest recording quality setting.
I suppose if you made up a test rig to use a buld or something to discharge the battery while connected to the device it could measure the mAh as the battery discharges.
I might be wrong (probably am 
), but it looks like a monitor that would measure the power flowing through it. I am not sure how it would measure the mAh of a battery simply by connecting to it.
Colin
For what it's worth to those checking in on this thread from time to time, I broke out the battery life decay rate for my 13 Arlo cameras grouped into 4 broad categories. (Note: 1 camera uses Nitecores; 5 use Eastshines; 7 use EagleTacs.)
Two of the categories are ultra low use (which include Eastshines and Eagletacs). The time periods are different (27 vs. 55 days), but you can see the gist from the graphs below.
The other two categories are closer to generally spec use (with a couple ulta low use mixed in). One of those horseraces (August 13-September 9 or 27 days) has 2X4 Eagletacs, 1X4 Nitecore and 1X4 Eastshine in the comparison (all between 4.2 and 5.5 minutes per day). It's interesting to note that the lowest average minutes per day Eagletacs (4.2 minutes) came in a distant last place even compared to the other EagleTac camera with higher use (5.0 min/day). However, a 5.0 minutes per day Eagletac grouping is beating a 4.5 min/day Nitecore grouping. The Eastshines camera happened to have the highest minutes per day recording (5.5/day) and are coming in 3rd. Would the Eastshines be ahead of the 4.5/min Nitecore or 5.0 min/day EagleTac if if the they recorded 30 to 60 seconds less per day? I don't know. Seems like a crap shoot to me.
I will say that the Eastshine outperformance (vs. EagleTac and Nitecore) in ultra low use cameras I observed early on appears to be persisting. I have about 6 cameras that barely record anything because they're largely set to either record only late at night or in areas where motion should not occur (and if it does I need to know about it ASAP!). 4 of those Cameras use Eastshines and 2 of those use EagleTacs... If we compare those on a drain rate per day, they come out the following:
Eastshine Cameras (drain rate per day): 1.0% / 1.0% / 1.1% / 1.1%
EagleTac Cameras (drain rate per day): 1.2% / 1.4%
The difference between a 1% per day drain rate and a 1.5% drain rate is the difference between batteries lasting 100 days vs. 67 days, so it's a meaninful difference.
In Summary:
1) I think I've seen enough to conclude definitively that Eastshines beat Eagletacs consistently in low use cameras because they appear to have a lower self discharge rate (as they sit idle). I believe Eastshines best Nitecores as well in these low use examples (from prior observations with less robust data), but the data below does not cover that.
2) Eastshines are at least equal to NiteCores and EagleTacs in Spec use (~4.5 to ~5.5 minutes per day).
The only possible caveat is that Eastshines will drop out really fast compared to Nitecore and EagleTacs once they get below the 20-30% charged range, but I don't find that likely given they have a higher mAh than both of those, and that they've generally shown a lower battery decay rate when sitting idle. However, I guess it's theoretically possible. I'll try to go another week or so before swapping out and recharing batteries, but I generally swap them all out in a specific area rather than waiting for each individual camera to die.
Note for the Charts Below: The chart legends (on the right) show the # of minutes per day recording / Battery Type / Install Date and Camera Name. You have to look at the minutes per day for each in context with the graph. For example, the 5.5 minutes per day Eastshine should be given some handicap vs. the 4.5 minute per day Nitecore... For example, the Eastshine batteries are at 33% after 27 days (and 5.5 minutes / day). The Nitecore is at 37% after 27 days (and 4.5 minutes per day). If the two batteries were equal, one would expect the Nitecore to be ahead of the Eastshine given the 1 minute less per day of recording.
I'm just Swapped Cameras 1-4 today as Camera 4 fell below 15%. I wanted to memorialize this for anyone interested before refreshing the batteries in those 4 cameras.
Also, the low use Eastshines (put in place on July 16) are still on pace for 100+ days.
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