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what kind of values does the AT%XVBAT AT command return on the Thingy91

I am trying to get battery % from the thingy91. I have the AT command AT%XVBAT running successfully. It returns what I assume is millivolts. However these value are higher than what I would expect. I have seen values of 4223, 4430, 4438, 4434, 4465. I am under the impression that a LiPo battery like the 1 connected to the thingy91 maxes out at 4.2 volts or 4200 millivolts. I have run the app for a while to drain the battery but I still continue to get the same high numbers. Am I misinterpretation what is being returned? Does anyone know how to read these values?

Also I found a LiPo voltage to charge % relationship chart for a baseline of what I expected

Capacity % voltage
100 4.2
95 4.15
90 4.11
85 4.08
80 4.02
75 3.98
70 3.95
65 3.91
60 3.87
55 3.85
50 3.84
45 3.82
40 3.8
35 3.79
30 3.77
25 3.75
20 3.73
15 3.71
10 3.69
5 3.61
0 3.27
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