A device that charges normally — the light behaves correctly and indicates full — but then won't actually fire or produce vapor is a genuinely different problem from one that won't charge at all. The charging circuit is clearly fine; something else in the firing path is the actual issue.
Check for the fire-button response or draw-activation indicator separately from charge status — a device can correctly show "charged" on its battery indicator while still failing to complete the actual firing circuit. Confirming which part is failing narrows down the cause considerably before troubleshooting further.
A coil not seated properly interrupts the circuit between battery and heating element regardless of how fully charged the battery is — the charge level and the physical connection are two entirely separate things, and a charged battery with a loose coil still won't fire correctly.
Similar to coil seating, the whole tank or pod assembly needs a solid connection to the battery's 510 thread to complete the circuit. A tank that looks attached but isn't fully screwed in produces exactly this symptom — charges fine, won't fire.
Some devices lock out firing after detecting a short circuit or an unusually low-resistance coil, as a built-in protective measure — this can look identical to a simple firing failure from the outside. Reseating the coil, or trying a known-working coil, helps rule this out.
A battery that charges to "full" according to its indicator light but has genuinely degraded with age can sometimes show charge status without being able to deliver the current actually needed to fire the coil properly. This is more common in an older device that's been through many charge cycles than a newer one.
No — if it's already showing a full charge indicator, charging it further won't help, since the problem is downstream of the battery, not the charge level itself. Reseating the coil and tank is a more useful next step.
No — a device that won't take a charge at all is a different problem, usually related to the charging port, cable, or the battery's charging circuit specifically, not the firing path.
On regulated devices, yes — though it's less common than a simple connection issue. If reseating the coil and tank doesn't resolve it and the device is otherwise undamaged, that's when a genuine internal fault becomes the more likely explanation.
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