3500 Puff

These are two separate properties and they are regularly confused. A charging port lets the battery be brought back up so it can outlast the liquid it was paired with. It does not let liquid be added. A device at this rating is still finished when the e-liquid is finished, and charging it after that point does nothing. Refillable devices are a different category again, built around replaceable pods or a tank that the user fills, and they are specified differently on the box. The distinction matters most at this rating, where a port is common enough to be assumed.

The mAh figure at this rating is normally lower than the charge needed to consume the full liquid volume, which is why the port is there. The connector is stated on the packaging, so check it there rather than assuming. A device sold as rechargeable is not always packed with a cable, so check before assuming one is included.

Within one manufacturer's own range, broadly yes, with two differences that matter. The liquid volume and the battery both increase. And a charging port is usually present, which the entry rating does not have. Across brands the comparison does not hold, because stated ratings are not comparable from one manufacturer to the next.

That cannot be answered from the specification. A puff figure is a count, not a duration, and converting one into the other requires assuming a rate of use, which the number does not contain and this page will not supply. What the specification does support is a comparison: a device at this rating holds more liquid than one at a lower rating from the same manufacturer, measured in millilitres on the box.

No. Within a single manufacturer's own range the battery is usually larger, which is the only material difference, and it is still sealed inside the unit and still goes to a battery or e-waste collection point rather than a household bin.