How to Tell a Weak Battery From an Empty Device
Read the screen, charge first, then look through the e-liquid.
5 min read
Key Takeaways
- A weak battery and an empty device both end in thin vapor, and the screen on a 25,000-puff disposable is there to tell them apart.
- The RAZ LTX 25K runs an 800mAh cell behind 16mL, and the Geek Bar Pulse X 25K runs an 820mAh cell behind 18mL.
- Geek Bar rates the Pulse X at 25,000 puffs in Regular mode and 15,000 in Pulse mode, so the mode changes how fast the e-liquid, not the battery, goes down.
- A flat cell comes back after a USB-C charge; an empty device does not, and the test takes one cable and a few minutes.
Two Problems, One Symptom
A disposable that stops performing has one of two things wrong with it. Either the battery is too low to drive the coil, or the e-liquid is too low to feed it. Both show up the same way at first: the draw gets thin, the vapor fades, and the flavor drops off. The difference is that one of them is fixable with a cable.
On a rechargeable disposable the battery is not the thing that is supposed to run out. The RAZ LTX 25K carries an 800mAh cell for its 16mL, and the Geek Bar Pulse X 25K carries 820mAh for its 18mL. Both cells will go flat several times before the liquid is gone, and each time the device will act as if it were finished.
The steps below sort the two cases in order of effort, so you charge before you throw anything away. Both devices have a screen, and that is the first thing to read.
What You Need
- The device, with its screen facing you.
- A USB-C cable and a low-output charger.
- A light source to look through the device body where the e-liquid is visible.
- A few minutes, because the charge test is the one that settles it.
The Steps
- Take one normal draw and watch the screen as you do it. If the screen does not wake at all, the cell is flat or nearly so, and that is your first answer.
- Read the battery indicator on the screen. A low or empty battery reading with an e-liquid reading still above empty means charge first and test again.
- Read the liquid indicator, where the screen shows one. On the Pulse X the mode shows as well: Geek Bar rates Regular mode at 25,000 puffs and Pulse mode at 15,000, so a device left in Pulse mode empties the e-liquid faster than the box number suggests.
- Plug in the USB-C cable and leave the device for a few minutes. A device that was only flat will show a charging indicator and fire again on the next draw.
- Draw again after the charge. Full vapor back means the battery was the problem; a draw that is still thin or tastes dry with a full battery reading means the e-liquid.
- Hold the device to a light and look at the e-liquid through the body where it is visible. Dry cotton or no liquid line confirms an empty device and no charge will change it.
- If the e-liquid still shows liquid and the battery reads full, stand the device upright for a few minutes before the next draw. Liquid that has drifted away from the coil needs time to re-wick, and a long chain of draws causes exactly that.
Symptom, Cause, Fix
| Symptom | Cause | Fix |
|---|---|---|
| Screen dark, no fire | Battery flat | Charge on USB-C, then draw again |
| Thin vapor, screen shows low battery | Cell too low to drive the dual mesh coil | Charge to full; the e-liquid is still there |
| Thin vapor, screen shows full battery | E-liquid nearly empty | Confirm against the light; the device is done |
| Dry, hot taste with liquid still visible | Coil not re-wicked after fast draws | Stand upright, wait, then draw gently |
| E-liquid gone well before the rating | Pulse X left in Pulse mode (rated 15,000, not 25,000) | Switch to Regular mode on the next device |
| Fires but weak with airflow closed | Airflow ring restricting the draw | Open the adjustable airflow and test again |
Where the Two Devices Differ
The LTX 25K and the Pulse X 25K carry the same 25,000-puff rating, an adjustable airflow ring, a dual mesh coil, a screen and a USB-C port. The battery sizes are close: 800mAh on the RAZ, 820mAh on the Geek Bar. The e-liquid capacities are not: 16mL on the RAZ against 18mL on the Geek Bar, so the Geek Bar has more liquid behind the same rating.
The Pulse X adds a second mode. Geek Bar lists Regular mode at 25,000 puffs and Pulse mode at 15,000, which means the box figure belongs to Regular mode only. Someone who has been running Pulse mode and finds the e-liquid empty early has not got a faulty device; the maker rated that mode at 15,000.
Both sit in our disposables range, and the Geek Bar lineup and the RAZ lineup carry their other sizes if 25,000 is not the number you want.
Pick It If, Skip It If
Pick the charge test every time, because on an 800mAh or 820mAh cell a flat battery is the common case and the cable is the easy answer. Pick the Pulse X 25K if you want the extra 2mL behind the same rating and you will run it in Regular mode. Pick the LTX 25K if 16mL at 25,000 puffs is enough and you want no mode to think about. Skip throwing away any disposable until the screen reads full battery and the vapor is still thin, because that is the only combination that means the e-liquid is gone.
FAQ
How Do I Know If My Disposable Is Dead or Just Flat?
Charge it over USB-C for a few minutes; if it fires again the 800mAh or 820mAh cell was flat, and if the vapor stays thin on a full reading the e-liquid is empty.
Why Did My Pulse X 25K Run Out Early?
Geek Bar rates the Pulse X at 25,000 puffs in Regular mode and 15,000 in Pulse mode, so Pulse mode empties the 18mL sooner.
Which Has More Liquid, the LTX 25K or the Pulse X 25K?
The Pulse X 25K, with 18mL against the LTX 25K's 16mL, at the same 25,000-puff rating.
Can a Weak Battery Make the Flavor Taste Burnt?
A low cell gives thin vapor rather than a burnt taste; a dry, hot taste with liquid still visible means the coil needs a minute to re-wick.
WARNING: This product contains nicotine. Nicotine is an addictive chemical.
