Advice on 26650 batteries

26650 is not “standard” cell size, so there isn’t a lot of choice.

However, HKJ deemed this cell good/acceptable.

The KEYGOS ones look a little shady, because 4800mAh and IMR don’t go hand in hand. Probably the capacity is exaggerated.

The trustfire cells you linked to is pretty good as well, and here’s a review: Review / Test: Protected Trustfire 26650 5000 mAh Battery from Manafont