All four current Flum devices are rechargeable via USB-C — but they are not refillable. Once the e-liquid is depleted, the device should be disposed of responsibly. This guide covers charging instructions for every Flum model, common charging issues, how long each device takes to fully charge, and tips to maximize battery life.
How to Charge Any Flum Vape — Step by Step
The charging process is identical across all four current Flum devices (Mello 20K, Float Mello Pro 50K, UT Bar Pro 25K, and UT Bar Pro 50K):
Locate the USB-C port — on the bottom of the device.
Connect a USB-C cable — use any standard USB-C cable. Plug the other end into a USB power source (wall adapter, laptop, power bank).
Check the screen — the LED or HD screen will show a charging indicator (battery icon or animation). On the Mello 20K, the animated screen shows a charging animation.
Wait until full — charging takes 30–60 minutes depending on the model. The indicator will change when fully charged.
Important: Do not vape while charging. Do not use fast-charge adapters rated above 5V/2A — standard phone chargers or laptop USB ports work best. Do not leave unattended while charging.
Charging Specs by Device
| Device | Battery | Port | Est. Charge Time | Charges per Lifespan |
|---|---|---|---|---|
| Mello 20K | 650 mAh | USB-C | 30–45 min | ~8–12 charges |
| Float Mello Pro 50K | Large capacity | USB-C | 45–60 min | ~15–20 charges |
| UT Bar Pro 25K | 650 mAh | USB-C | 30–45 min | ~10–14 charges |
| UT Bar Pro 50K | Large capacity | USB-C | 45–60 min | ~15–20 charges |
The 50K models have larger batteries and take slightly longer to charge, but they also last proportionally longer between charges. The 20K and 25K models with 650 mAh batteries charge faster but need more frequent charging over the device's total lifespan.
Turbo Mode note: If you use Turbo Mode on the Float Mello Pro 50K or Smooth/Turbo on the UT Bar Pro 25K, battery will drain faster than in Eco/Smooth mode. Expect to charge more frequently when using high-power modes.
Troubleshooting Common Charging Issues
| Problem | Likely Cause | Fix |
|---|---|---|
| Not charging — no indicator | Loose connection or debris in USB-C port | Try a different cable. Gently blow into the port to clear dust. Try a different power source. |
| Screen flashes but won't charge | Power source too weak or cable issue | Use a wall adapter instead of a laptop USB port. Try a different USB-C cable. |
| Charges but dies quickly | E-liquid nearly depleted — device nearing end of life | Check the e-liquid indicator on screen. If e-liquid is low, the battery draining fast is normal — the device is almost finished. |
| Device gets warm while charging | Normal for lithium batteries during charging | Slightly warm is normal. If it becomes hot to touch, disconnect immediately and stop using the device. |
| Burnt taste after charging | E-liquid depleted — coil is dry-firing | This means the e-liquid is gone. Charging the battery will not restore e-liquid. It is time to replace the device. |
Tips to Maximize Battery Life
- Use Eco/Smooth mode when possible — Turbo Mode drains battery roughly 30–40% faster. Switch to Eco or Smooth mode for daily use and reserve Turbo for when you want a stronger hit.
- Charge before fully dead — Lithium batteries perform better when you recharge at 10–20% rather than waiting until completely empty.
- Avoid extreme temperatures — Do not leave your Flum in a hot car or direct sunlight. Heat degrades battery performance. Cold weather can temporarily reduce battery output.
- Do not chain vape while charging — Let the device charge fully before using it again. Using while charging stresses the battery and can reduce its lifespan.
- Use a standard adapter — 5V/1A or 5V/2A USB adapters are ideal. High-wattage fast chargers (like laptop USB-C PD chargers) can potentially damage the device's charging circuit.
Frequently Asked Questions
Can you charge a Flum vape with an iPhone charger?
If you have a USB-C iPhone charger (iPhone 15 and newer), yes — it works with all current Flum devices. Older Lightning iPhone chargers are not compatible. Any standard USB-C cable with a USB power source will work.
How do I know when my Flum is fully charged?
On the Mello 20K, the animated screen shows a full battery icon and the charging animation stops. On the UT Bar Pro 25K, the Galaxy LED screen shows a full battery indicator. On the 50K models, the HD screen shows a complete battery icon. Charge time is typically 30–60 minutes.
Can I refill a Flum vape?
No. All Flum vapes — including the UT Bar Pro 50K with its dual tanks — are fully disposable. The tanks are factory-sealed and cannot be opened or refilled. Once the e-liquid is depleted, the device should be disposed of responsibly and replaced. This applies to all current models: Mello 20K, Float Mello Pro 50K, UT Bar Pro 25K, and UT Bar Pro 50K.
Why is my Flum vape blinking while charging?
A blinking light during charging typically means the device is actively charging — this is normal behavior. If the light blinks rapidly and stops (no charging indicator on screen), the issue is usually a cable or connection problem. Try a different USB-C cable or power source. If the problem persists, the battery may have reached end of life.