The Eleaf iStick X40 and Eleaf iStick XC100 are two Eleaf mods aimed at different styles of vaping. One is built around a tight, restrictive draw at lower power, while the other is set up for higher output and a more open airflow experience.
This comparison sticks to the specs and notes provided, calling out where the data supports a clear winner and where it does not.
| Spec | Eleaf iStick X40 | Eleaf iStick XC100 |
|---|---|---|
| Image |  |  |
| Max outputPerformance | 40 W | 🏆 100 W |
| Battery typeBattery | removable | Single 18650 or 21700 |
| Battery capacityBattery | 3000 mAh | Not stated |
| DisplayConvenience | Yes | Yes |
| Charging portBattery | USB-C | USB Type-C |
| Coil/tank compatibilityCapacity | 0.4Ω, 0.8Ω, and 1.2Ω | EC-D, EC-A, EC-2, EC-M, EC-N |
| Vaping stylePerformance | MTL | DTL |
| Safety protectionsBuild | Usual | Over-charge, low battery, over-current, over 10s cutoff, short circuit, reverse polarity |
| Build materialBuild | lightweight zinc alloy | Aluminum alloy |
| Best US priceat time of comparison | $49.90* | $39.99* |
| Read Review & Best Price | Read Review & Best Price |
* Lowest US price we found on 26 Aug 2026. Prices change often — see each review below for live pricing.
Performance
The Eleaf iStick XC100 wins performance outright, with a max output of 100 W against the Eleaf iStick X40’s 40 W. That gap also lines up with how each device is meant to be used: the X40 is built for MTL vaping, where lower power is normal and expected, while the XC100 is set up for DTL vaping, which typically calls for higher wattage to drive airier coils. The coil options reflect this split too, with the X40 running 0.4Ω, 0.8Ω, and 1.2Ω coils suited to tighter draws, and the XC100 using the EC-D, EC-A, EC-2, EC-M, and EC-N series aimed at direct-lung use.
Battery
Battery is called insufficient evidence, and the facts explain why: the Eleaf iStick X40 has a removable 3000 mAh battery, while the Eleaf iStick XC100 is listed as using a single 18650 or 21700 cell with no stated capacity. Without a capacity figure for the XC100, there is no like-for-like number to compare against the X40’s 3000 mAh, so no winner can be fairly assigned here.
Convenience
Convenience is a tie. Both devices include a display, and both charge over USB-C (listed as USB-C for the X40 and USB Type-C for the XC100, which describe the same connector). With no meaningful difference in these day-to-day usability points, neither device pulls ahead.
Capacity
Capacity is marked insufficient evidence. The X40’s coil/tank compatibility (0.4Ω, 0.8Ω, 1.2Ω) and the XC100’s coil lineup (EC-D, EC-A, EC-2, EC-M, EC-N) describe resistance and coil type, not tank juice capacity, so there is nothing in the facts to compare on actual e-liquid capacity.
Build
Build is also insufficient evidence. The Eleaf iStick X40 uses a lightweight zinc alloy build and the Eleaf iStick XC100 uses aluminum alloy, but these are different materials described only qualitatively, with no weight, dimension, or durability figures given to judge one as sturdier or better made than the other.
The Eleaf iStick X40 suits vapers who want a straightforward MTL setup with a known, removable 3000 mAh battery rather than higher wattage output.
The Eleaf iStick XC100 suits vapers who want higher power for DTL vaping, backed by its 100 W max output and broader EC coil lineup.
The verdict
The Eleaf iStick X40 and Eleaf iStick XC100 are not really competing for the same job. The XC100 is the clear performance pick thanks to its 100 W ceiling and DTL-oriented coil lineup, while the X40 sticks to a simpler 40 W MTL setup with a known 3000 mAh removable battery. Convenience comes out even on display and USB-C charging, and there just is not enough detail in the specs to call a winner on battery capacity beyond the X40’s stated figure, tank capacity, or build quality. Choosing between them comes down to whether MTL or DTL vaping, and low or high wattage, fits what you actually want.