Unit property variable reported as undefined or having 0 value

[Rob Lewis]

I have a CAPACITY unit "Capacity in % of Battery". It has a numeric unit
property min_battery_percent, currently set to 40. But when I try to access
it, I get an error: 

2016-10-07 13:41:54 Script error -2753: The variable min_battery_percent is
not defined.

> 
 This happens at startup, and also if I put this in the Command Line: 
tell xUnit "Capacity in % of Battery" to write log (Get Unit Property
min_battery_percent)

> 
 Oh, wait, did I forget to enclose the property name in quotes?: 
tell xUnit "Capacity in % of Battery" to write log (Get Unit Property
"min_battery_percent") 

> 
 That causes this to be logged: 
2016-10-07 13:46:24

> 
 Yep, just a timestamp. How about adding "as number"? 
tell xUnit "Capacity in % of Battery" to write log (Get Unit Property
"min_battery_percent") as number

The log: 
2016-10-07 13:47:18 0

> 
 Just a zero (actual value is 40). How about "as text"?
tell xUnit "Capacity in % of Battery" to write log (Get Unit Property
"min_battery_percent") as text

> 
 Result: 
2016-10-07 13:52:31

> 
 Back to just the timestamp. What's going on here? 

> 
 My only guess is that maybe there's something about having a percent sign
in the unit's name. 

> 

Ideas?
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