You won’t regret, this is the real thing. It’s the battery that finally jacks my Nightwatch NS14R v2 across 20000 lumen for Turbo output. Very obviously higher than any other battery I have.
Most significant difference seen only with extreme high-output ~10000 lm lights though. In lights with less power demand, the boost is not as noticeable. (My testing is not on JP40, but its twin the AM04 battery from 18650-21700 website.)