Originally Posted by
Alan K
At temp like today (low -5, high 9), using a 4 battery pack in my jacket, I can comfortably go for about 1.5-2 hr. But I wouldn’t want to use the battery a second day without charging it again. [These are good quality Samsung batteries with a controller circuit built into each battery.]
If I place the battery at the ambient temp, I’m sure it will get less time out of them.
for fun(?), or at least some education, you can put your lights in the fridge or freezer, and see how long they run. Let them sit in there for an hour or two before beginning the test, in order to allow the internal parts to fully cool off.
Steve in Peoria (thermal tests were a routine part of designing electronics for me back in the old days)