Happy new year pilots. I went up for a bit to see if I could find fireworks. I topped off my battery as usual first, however it was running 3.9 at takeoff. Each cell seemed lower than my other battery's fresh start levels with the two outside cells being around .1 lower than the inside ones. I didn't put it through much stress, kept it low and hovered around till I reached 50%. The voltage started at 3.9 to maybe 4 just after warmup and finished around 3.7 to 3.9 at 50% flight time left. About 50 degrees outside and running all 1.6. Any worry here or am I just being a batt wimp? Thanks!