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500 cycles is consistent with usual manufacturer claims; it is commonly that after 500 cycles, one may expect capacity to fall to 80%, hence, for this unit, about 15000 mAh.
I imagine the unit has 5 or 6 18650 cells inside, so it is conceivable that one could crack it open and replace cells. Mind you, I also imagine that this pack would be in dodgy shape by then due to rattling around knapsacks and such, and that better may be available in 5 years.