In the Spirit online manual, RB2C is described as the BEC voltage. But on my FrSky Horus after telemetry discovery, that particular RB2C stream defaults to units of mAh, not volts. I think this is an error/bug.
Here's the excerpt from the manual.
I’m thinking it should be voltage as described in the manual and that the Spirit unit is transmitting the wrong units info. (If it helps I can get a photo of my telemetry screen to show.)
I do know I can change the units easily enough myself, but I thought I'd point out the discrepancy.
Horus X10S ACCST, iXJT v2.1.0
OpenTX 2.3.5
YGE 35 LVT
uSpirit 3.1.0