enook 26650 question

i have an enook 26650 i recently changed its outer covering.
*the problem is that it wont charged using nitecore d4
*my other enook 26650 (which still has its original outer covering) charges with no problem
*led flashlight lights up when i attached it to the 26650
*small motor works when i attached it to the 26550
*checking its volts = 4.02
what could be the problem.

Isn’t an Enook 26650 ( :question: ) a flattop battery ? The top may just make contact, if you are lucky. Or not.
Maybe you made the new wrap just a tiny little bit to large. Try putting a small magnet on the top.

To people with just two thumbs, try things first by putting a small copper washer between + and charger.

wow. you got it right!!! the wrap on the bottom part of the battery kinda blocks the lower metal contacts. thank you.