Living in Arizona in the summer poses more than human challenges. The temps outside have been hovering around 108. I keep the p3 in the garage. So I needed to do an update thought well I'll charge the battery..in the garage. I've got three batteries so put the newest one on the charger...not really charging...put batt 2 on..nothing..batt three on...nothing. Thought I better check the manual to see what might be the problem. Hmmm charger doesn't work above 40C,,,well that's 104F. Brought the charger in the house temp about 80, and sure enough charged the battery in no time..lesson learned!