Seeing the reviews I was expecting these to work up to par with energizer batteries or Duracell: these did not. I got these to use along with an LED bandana I had purchased. I ordered two bandanas & when we put the batteries in one of the bandanas barely worked. I was very upset thinking the bandana was faulty & played with the batteries I had put in it. Nothing changed. Eventually ended up putting in another two of the batteries in the pack & it worked perfectly. It seems not all the batteries in my pack were good. Upsetting experience but the batteries that did work seemed to work for a decent amount of time; again these were nothing like energizer or Duracell so do not expect that quality.