The Caliburn G4 uses a GPP cartridge with an integrated coil. Replace the complete cartridge when needed; the coil is not replaced separately.
Look for a compatible GPP replacement cartridge and match its resistance, capacity and fill format to your G4.
GPP, and what it fits
UWELL states that the GPP cartridge serves the G3, G4 and G5 families. One part covers three generations, which is unusually convenient and is the reason the platform is worth understanding rather than guessing at.
Four resistances are made: 0.4, 0.6, 0.9 and 1.2 ohms. The cartridge is on Replacement Pods. Nothing on Replacement Coils fits this device, because the coil is not a separate part on this platform.
The older Caliburn G and G2 work the other way round: an empty pod plus a coil you press in. If you have moved up from one of those, the buying habit changes with the device.
Which resistance, and the liquid that goes with it
Use a suitable 50/50 liquid and choose nicotine concentration according to the exact liquid, cartridge, device and operating-power guidance. Suitable 0.6Ω-and-above stocked pod/MTL configurations are not excluded merely because they are below 1Ω, but this does not approve every concentration at every power. Perceived smoothness or harshness alone does not establish delivered dose. ELFBAR ELFLIQ 10ml and BAR Salts are stocked in 50/50 ranges. The supported GPP power band depends on the fitted resistance.
The 0.4Ω and 0.6Ω cartridges offer different supported power ranges and draw characteristics from the higher-resistance options. Follow the exact GPP cartridge and device guidance when selecting liquid ratio, nicotine concentration and power; do not infer a universal 10mg requirement or a measured response to 20mg from resistance alone.
Two adjustments change the draw further: a slider on the body, and the cartridge itself, which can be loaded either way round. That second one is easy to miss and makes a real difference.
Power and screen
Up to thirty-five watts, adjustable, triple-click to enter the setting and change it on screen. The screen is a 0.85-inch colour panel with a puff counter and a day and night mode.
A 1300mAh cell charges over USB Type-C at 5V and 2A. It is sealed, so batteries are not a page this device needs; that shelf serves the mods here that take removable cells.
Cartridge life
A GPP cartridge is a consumable with an integrated coil. Its life depends on liquid, selected power, puffing pattern and maintenance. The flavour name alone does not establish a comparative lifespan; replace the complete cartridge when its condition requires it.
The practical habit is to order cartridges alongside the liquid. On a device where the coil cannot be replaced separately, running out of cartridges stops the device outright.
Product and variant overview
One device, one cartridge platform, four resistances. The Caliburn G4 takes the GPP cartridge, shared with the G3 and G5 families, at 0.4, 0.6, 0.9 or 1.2 ohms.
Compatibility and related products
- Cartridge: Caliburn GPP, coil sealed in. See Replacement Pods.
- There is no separate G4 coil. Nothing on Replacement Coils fits this device.
- GPP also fits the G3 and G5 families, so a spare travels between them.
- Internal 1300mAh cell; nothing needed from Batteries.
- Liquid: suitable 50/50 liquid, with concentration selected using the exact liquid, cartridge, device and power guidance.
Buying guidance
- Buy a cartridge, not a coil. The coil is inside the cartridge and is not sold on its own.
- Choose nicotine strength using the exact liquid, GPP cartridge and device guidance; resistance alone does not establish suitability.
- Before reusing a GPP spare across models, check the exact device, cartridge size and capacity, resistance and supported power.
- Try the cartridge loaded the other way round before deciding the draw is wrong. It is a genuine adjustment.
- Order cartridges with sweet liquids rather than after them.
Kenya and Nairobi relevance
Supported GPP cartridges are used across G3, G4 and G5 models. Match any spare to the exact device, cartridge size and capacity, resistance and supported power before ordering. Nairobi dispatch is same-day, with 1 to 2 business days elsewhere in Kenya.
For a full breakdown of battery life, coil performance and day-to-day use, read the Caliburn G4 review.
Not sure whether to upgrade? The G4 vs G4 Pro comparison covers what each model adds and whether the Pro is worth the price jump.