I'm not surprised by the four powerbanks because I know a person who had the same amount and his reason was simple; while using one, he can be charging the others.
Gosh! @wongi, I'm jealous of you and your state
Also, there's no need to be😂, you have four functioning powerbanks plus one more in the nearest future. You're all good 😄
Nothing can be compared to electricity you know. I mean the NEPA own. Or haven't you heard that Nepa is that real original light? Lol😂