button tops are mandatory for XT2C series
if its an older model the battery you picked should be perfect enough
if its a 2018 model (with USB rechargeable) i recommend sony VCT6 protected for getting the max output, the xt2c tends to drop down fairly easy with batteries lower than 7~8amp...
from a not-so flashaholic individual, Klarus XT1A had served me well so far that i enjoyed despite it has few disappointments such as PWM on lower mode and unanodized threats.