Hmm.
Doubt it could physically run 40k lumens for 30 min.
Well, being a 40000 lumen light and having 12x XHP70.2s, it must be pushing out about 3400 lumens per XHP70.2.
Knowing that an XHP70.2 consumes 22W at that power level, it means that the light is consuming at least 270W of power at max brightness.
Even if you were using NCR18650GA and not taking into account internal resistance, you would have at max a battery capacity of 100Wh. Meaning at 40k lumens, you would have a max, down to 2.5V, runtimes would be a max of 20 mins, not 30 mins. That would be even less down to 3V and counting internal resistance, and that the cells are probably 30Qs and VTC6s, not 3500mAh GAs.
It is physically impossible to get 30 mins even with an 8 cell battery pack at 40000 lumens. Maybe 30000 lumens, but not more.