For battery status, I'm not positive (documentation is vague), but I believe 1 is low and 0 is normal for the battery (unsigned short), same as all the other sensors.
This is valid for the 7in1 Sensor, but e.g. the WH57 Lightning Sensor counts the Battery status down from 5 to 1 (or zero?) I could believe that all newer sensors work like this. My WH57 is currently at „4“...
Okay yes you are correct. There are some sensors that have a power level and other sensors that don't and only show 0 good or 1 low. In this case the WH57 is one with levels. Power level 0~5, when the power level <=1, it displays low voltage. But the WH34 is different and has even more complexity in how it works. See below.
It may seem backwards for the ones that only have a good or low indicator. But it is basically reporting a condition of low battery. In computers 1 means true. The check is for low battery condition. I suppose they could have made check for good and then made that be the 1 for true, but that isn't what happens in the software. In the software the low power indicator is either on or off. Therefore it would only need to be turned on if low and that is the true statement that you are looking for. In the case of power levels then they are always reporting and then the logical choice is that the higher number means more power.
EDIT: The following has been corrected for prior errors from initial post
These sensors have just the indication as 1 low power indicator and 0 being good (no levels):
WH65
WH40
WH25
WH26
WH31
WH51
These are the sensors with power level 0-5 with <=1 being low:
WH41
WH57
WH55
Special case:
WH68 Voltage=val*0.02V When <=1.2V, display low voltage
WS80 Voltage =val*0.02V When <=1.2V, display low voltage
WH34 Voltage=val*0.02V When <=1.2V, display low voltage