The Koko is the box-shaped member of the Caliburn family, and the useful thing about it for an owner is that UWELL publishes a wattage band for every cartridge resistance. Most manufacturers do not, which leaves you guessing; here the guessing has been done.
A 1600mAh cell, output to thirty-five watts in one-watt steps, and the same GPP cartridge as the rest of the current family.
The published bands, and why they matter
UWELL gives 19 to 35 watts at 0.4 ohms, 13 to 25 at 0.6, 9 to 15 at 0.9, and 6 to 11 at 1.2. Setting a cartridge inside its band is the difference between a coil doing the job it was designed for and one being asked to do something else.
It also tells you what each resistance is for without having to try them. The 1.2 at six to eleven watts is a tight, sparing mouth-to-lung vape; the 0.4 at up to thirty-five is a different device entirely in the same shell.
The cartridge
GPP, coil sealed in, on Replacement Pods. There is no separate coil for this platform, and nothing on Replacement Coils fits it.
Both side-fill and top-fill versions of the GPP run in this device, which is a small convenience worth knowing when you are choosing between listings.
Airflow comes in from the top and adjusts across a range from mouth-to-lung through to a restricted lung draw.
The liquid for each band
At 0.9 and 1.2 ohms, which is the tighter and lower-wattage end, twenty milligrams of 50/50 salt is the right fill. ELFBAR ELFLIQ 10ml and BAR Salts are both filled there.
At 0.6 and below, the wattage band roughly doubles and so does the liquid you get through. Ten milligrams is the sensible strength at that end, and ELFBAR ELFLIQ 10ml carries it.
No configuration of this device is a home for a 70/30 freebase bottle. That is tank territory.
Charging and daily use
Five volts at two amps, with a battery reading from zero to ninety-nine per cent rather than a set of bars. UWELL quotes up to six days of use per charge, which is a manufacturer figure and depends entirely on how much you vape.
The device weighs about sixty-six grams. The cell is sealed, so the battery is not a shelf it needs.
Cartridges wear with the liquid. Dessert and sweet bottles use one up sooner; with no way to swap the coil by itself, the whole cartridge is what gets replaced.
Product and variant overview
One device, one cartridge platform, four resistances with published wattage bands. The G5 Koko takes GPP cartridges in both side-fill and top-fill form, on a 1600mAh cell.
Compatibility and related products
GPP is shared with the G3, G4, and G5 families.
Liquid: 20mg salt at 50/50 at 0.9 and 1.2 ohms; 10mg at 0.6 and below.
Buying guidance
Set the wattage inside the published band for your cartridge. UWELL has done that work, and it is worth using.
Buy cartridges rather than coils. There is no coil for this platform sold on its own.
Drop the nicotine strength when you drop the resistance. The two move together.
Either fill orientation of the GPP works here, so buy whichever listing suits you.
Treat the six-day figure as a manufacturer estimate rather than a plan.
Kenya and Nairobi relevance
A device that publishes its own wattage bands removes most of the trial and error from setting one up, which matters more in Kenya where a wasted cartridge is a wasted order rather than a walk to the shops. Nairobi orders leave same-day; elsewhere in Kenya takes 24 to 48 hours.