If the X26E is left unused for an extended period of time the first few sparks of a trigger pull may appear to be slower than usual. The device should resume normal speed after a 1-2 cycles.
Caution: Remove the cartridge before spark testing the CEW.
If after 1-2 cycles the spark is still slow try a known working battery with this CEW.
If the issue is still not resolved the unit will need to be sent to Axon for inspection.