or you could do something like pretty easily . I wanted a light in mine also , but wasn ' t happy with the capacity of a single cell and the larger powerbanks they sell seemed like a waste of money . It looks but I don ' t care lol . Just need some good identical protected cells to parallel up , the charge circuit from nearly any powerbank these days , your choice of LED and heatsink , a driver , and I decided to throw one of those cheap digital volt readouts in there too . I only used this plastic case cause it was laying around at the time and I had nothing better . If you go with a super cheap circuit from a powerbank it may not fully charge multiple cells in parallel but I ' m using a cheapo circuit and it charges the 2 cells to nearly all the way . Most of these circuits I have seen are pretty straightforward . You charge a peripheral or recharge the cells just by plugging them in accordingly . I ' ve seen some that have little momentary switches on them that seem to activate the blinking power level and charge indication , but still charge without the use of the button though pressing the button actually ups the output a little . Some larger banks charging circuits don ' t even bring them above 4 v . If you found the right housing , with some innovation you could fairly easily make a nice looking one that is also relatively water proof . This little bank got me through a power outage pretty handily . While other single crappy 18650 power banks were giving me less than a full phone charge , I was able to fully charge my phone a couple times while running the light on low mode .