Are you charging the battery on an external charger? (recommended)
Do you have more than one 18650 battery? (recommended)
If the battery has spent it's life in the Xcube, do you regularly clean the internal battery contacts and the POS/NEG contacts on the battery? (recommended)
A
Rebuildable Tank Atomizer and a
Rebuildable Dripping Atomizer are different.
Have you checked the build in the Berserker?
Is the coil broken or out of shape?
Are the coil screws tight?
Is the coil dirty?
How often do you recoil and rewick?
Is the 510 thread wet or coated in residue?
Is the 510 socket on top of the X-cube clean and dry?
Has liquid- ejuice or other gotten into the X-cube body?
Link to chart of suggested batteries
AWT being conspicuously absent.
Cheers
I