“Turbo ~ 4100lm. Yes, a bit low compared to declared 5500lm. It was my measurements, so can be not as accurate as…you know. Not very accurate. But 1400lm lower is a lot lumens lower.”
I think that with a high-current battery, the brightness output will be greater. It is worthwhile to conduct additional testing with batteries, for example VTC6 or INR21700-40T.