Today I received one of these:
You can replace the internal battery pack! This is great, because I can purchase any 18650 Lithium Battery and stick it in and have a nice power bank. when it runs out i simply stick in some more and bang I have a fully charged power bank again. Provided i keep a bunch of spare 18650 cells charged, I will not need to pack a shit load of power banks for the wow suit. Ill be able to take 4 of these and then enough Battery modules to replace each box 3 times. This is all just theoretical as I have not yet tested their performance. If they don’t work, ill just end up using a ton of individual power banks.