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Once I get 15 charges on raids...

Can I play in any order?, I mean can I play 2 or 3 times without missing the increase damage or I need to wait for my team mates?
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How I understand it.
The 15 charges outside the fights increases our in-fight damage. And those are capped at 10x, 5 are extra. I think everyone knows that.
So, When raids were launched,
while fighting Ulron, I wasn't dealing any noticeably damage till the later half of the fight, untill I built the inside charges too.
So you are right, 1 inside charge is needed to activate the 10x bonus.
But op is asking about the outside charges.