They are rubbish. Anything that claims to be above around the 3500mAh region is generally fake like these. They are using the Trustfire flames with Utrafire brand name.
Panasonics are excellent and these Trustfire cells are pretty good (what I use). Prices are steep here but at least you can normally get them. From DX they have cost me about NZ$12.50 a pair at my door in the past.
TrustFire 18650 3000mAh PROTECTED Battery x2 | Trade Me
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