Agro
(Agro)
60
Interesting. 
I have USB ones only, it’s quite inefficient to boost power to 5V only to have the lights use resistors to bring it down. And also I lack a powerful enough powerbank, direct connection is better in this regard. This battery box variant may be nice…but I need to figure out some reasonable 18650 / 21700 box.
Maybe some cheap plastic powerbank with electronics replaced….