Standby current ranges from 77mA to 136mA across 5 different CityHubs

[TrainsWithLights]

Just completed uploading new code to 5 hubs with the code displaying the operating voltage and current. I was quite surprised to see these readings;
77mA, 101mA, 123mA, 126mA and 136mA.

Typically, component tolerances are less than 5% and the micro A/D converters are also quite accurate as seen in the voltage readings below.
(For each hub, the same fully charged battery pack was used and each time measured 8.97 volts.)

Are there known multiple versions of hardware that cause this problem? 4 of the hubs look identical in terms of the actual PCB, with the 5th PCB clearly a different version and the one that produces the 77mA current draw...

[dlech]

5th PCB clearly a different version and the one that produces the 77mA current draw...

It sounds like they managed to make it more efficient. I didn't know there was a revision, so makes me curious what might have changed.

I don't think the current measurement is super accurate, especially at lower values. But you could always measure it externally and compare that to what the hub on-board reading is to see how accurate it is.

[TrainsWithLights]

Turns out that the micro current readings do not accurately measure circuit standby current, but are better for motor/led power consumption.
An external circuit was set-up to confirm real-world measurements, with these results

CityHub reported values	Hub 1		Hub 2		Hub 3		Hub 4		Hub 5
CityHub  standby mA	77		100		112		120		123
Light  (delta)		21		32		33		33		30
Train Motor  (delta)		67		77		90		90		77
Multimeter readings mA
Measured standby	34 mA		35 mA		44 mA		42 mA		44 mA
Light  (delta mA)		33		34		33		33		35
Train Motor  (delta mA)		81		82		80		81		80

Note: The Hub LED was OFF during the tests. Turning on the LED added 7mA of current draw at 9.1 volts.