Until recently, I was able to use it without any problems, from full power to minimum, and as a slave flash. I would take it out about 20 times and use it until the battery died, and other times I wouldn't use it at all. I'm selling it now because I recently bought a battery-powered strobe. YONGNUO YN560 III strobe, with carrying case. - Brand: YONGNUO - Model: YN560 III - Voltage: 6V - Included items: Case Thank you for looking.