Haha yeah that’s true! And okey might try them then! Just gotta find a swedish store that sells them since the taxes for import to Sweden is crazy (shipping cost then 6.5% for taking it in (fullprice + shipping cost) to Sweden and then 25% in taxes (25% from the new price that comes after that 6.5%)) But if they tell me that I can return them and get new 26650 ones should I use them instead of ordering new 18850? (The batteries is after all not the ones they said it would be so it’s their fault.) And I’ll just tells them it was a christmas gift so I just noticed it 
There should be a retaining ring that threads down into the tail. Use a needle nose pliers and take it out. Then remove the cap from over the spring, and reassemble. This work a lot of times when longer cells cause sporadic connection.
Are you seeing any dents on the ends of your cells?