Great battery life, 3 plus hours and still had charge. Very regular use and managing a few years of long extended use. No corrosion issues and the original batteries hold charge longer than i can remember. The 1000 lm torch has a convenient charging port in the back that connects to usb.
I won’t buy any other torch, having bought several replacement over the years due loss. I’m not as gentle on my torches as i should be and they do get banged around. I took one of my older 2 plus year torches to work and accidentally dropped it onto concrete from 2.5m and it still worked. it's amazing the glass didn’t break. I think I’ve bought at least 6 now and have 3 torches i use rotation - two for dives and one for work/spare. Several times I’ve had to pick up torches late notice because of loss or misplacing and Ali has bent over backwards to help me get one quickly!