Powerbanks up to 26800 mAh are allowed. Even slightly higher I think (100Wh)
You are allowed to carry many of such powerbanks.
So a 40000 mAh power bank would be forbidden, but 10x 26800 mAh powerbanks are fine.
Your 18650’s are way below 26800 each, so no problem.
I travel a lot and the batteries I take with me on all flights:
1x 26800
10x 3500 mAh 18650
1x 5500 mAh 26650
1x 4200 mAh 20700
1x 4400 mAh 21700
1x phone with a battery that’s bigger than your 18650
1x laptop with a battery that’s way bigger than your 18650
My baggage is openend about 40% of my trips for extra inspection. Never ever a single word about my cells.