The Eleaf iStick X40 and GeekVape Aegis Mini 5 target different priorities, one leaning toward simple MTL vaping and the other built for more power and rugged handling.
This comparison sticks to the specs on record, calling out clear winners where the data supports it and flagging categories where the evidence is too thin to pick a side.
| Spec | Eleaf iStick X40 | GeekVape Aegis Mini 5 |
|---|---|---|
| Image |  |  |
| Max outputPerformance | 40 W | 🏆 100 W |
| Battery typeBattery | removable | Not stated |
| Battery capacityBattery | 3000 mAh | 3200 mAh |
| Durability ratingBuild | Not stated | IP67 |
| DisplayConvenience | Yes | Yes |
| Charging portBattery | USB-C | Type-C |
| Coil/tank compatibilityCapacity | 0.4Ω, 0.8Ω, and 1.2Ω | Universal 510 |
| Vaping stylePerformance | MTL | MTL / DTL |
| Safety protectionsBuild | Usual | Not stated |
| Build materialBuild | lightweight zinc alloy | tri-proof |
| Best US priceat time of comparison | $49.90* | $55.49* |
| Read Review & Best Price | Read Review & Best Price |
* Lowest US price we found on 21 Aug 2026. Prices change often — see each review below for live pricing.
Performance
The GeekVape Aegis Mini 5 wins this category on output alone, offering 100 W compared to the Eleaf iStick X40’s 40 W. That gap matters for vaping style too: the X40 is built strictly for MTL, while the Aegis Mini 5 supports MTL/DTL, giving it more range to work with higher-power setups. The X40’s fixed coil options (0.4Ω, 0.8Ω, 1.2Ω) versus the Aegis Mini 5’s universal 510 compatibility also point to the GeekVape as the more flexible performer, though coil compatibility itself wasn’t scored as a direct win due to differing formats.
Battery
Battery capacity is a tie in practical terms: 3000 mAh for the Eleaf iStick X40 versus 3200 mAh for the GeekVape Aegis Mini 5 is a small enough difference that it doesn’t meaningfully separate the two. The X40 does specify a removable battery, which the Aegis Mini 5’s listing does not confirm one way or the other, so that particular detail has no comparable data to judge.
Build
There isn’t enough comparable evidence to call a winner on build quality. The Eleaf iStick X40 is described as lightweight zinc alloy, while the GeekVape Aegis Mini 5 is described as tri-proof with an IP67 durability rating, but the X40 has no listed durability rating at all, so the two can’t be measured against the same standard.
Convenience
Convenience comes out as a tie. Both devices include a display, and both use a USB-C style port (labeled USB-C on the X40 and Type-C on the Aegis Mini 5), which functionally amounts to the same charging standard even though the listing treats them as non-comparable due to naming differences.
Capacity
There’s insufficient evidence to declare a winner for capacity. Coil and tank compatibility differ in kind rather than degree, the X40 lists specific resistance options while the Aegis Mini 5 lists universal 510 support, and there’s no shared metric like tank volume or juice capacity provided for either device.
The Eleaf iStick X40 suits vapers who want a simple, dedicated MTL device with a removable battery and don't need high wattage.
The GeekVape Aegis Mini 5 suits vapers who want higher power output, MTL/DTL flexibility, and an IP67 durability rating for rougher daily use.
The verdict
Neither device comes out as an outright winner across the board. The GeekVape Aegis Mini 5 clearly leads on power output, which matters if higher wattage or DTL flexibility is the priority, while battery capacity and convenience features land as ties between the two. Build quality and tank capacity can’t be fairly judged given the gaps in the listed specs, so buyers weighing those factors will need more information than what’s on record here.