I also have an issue with Life Support v0.13.2 and the electric charge (I'm using it with background processing). I made a screen shot to illustrate the problem. Electricity charge is near the maximum, but the life support monitoring shows that I'm without electricity for almost 2h. But it seems to be only an issue with the calculation for the display because the Kerbals don't die.
Save and log file: https://ufile.io/q5ogv
Edit: It looks like the same problem as KerikBalm said
But I have the BackgroundProcessing mod installed.