# Voopoo Drag X Pro, the kit read from its battery > The Voopoo Drag X Pro from the battery side, 21700 or 18650, the amps each coil draws, which cell to pick, battery life in watt-hours and USB-C charging. On shop listings, the **Voopoo Drag X Pro** boils down to three lines, 100 W, a TPP-X pod and "battery not included". That last line carries the most weight. The kit ships without its power source, so the cell is left to the buyer, and the listing never says what the mod will ask of it. Before talking about clouds, it is worth opening the battery door and looking at what happens inside the bay. ## Voopoo Drag X Pro, what the kit asks of its battery The **Voopoo Drag X Pro** runs on a single external cell, either a 21700 or an 18650, with output adjustable from 5 to 100 W. At full power, the mod draws roughly 28 A from a charged cell and more than 31 A from a cell near the end of its charge. The battery you choose should therefore carry a continuous discharge rating, published by its own manufacturer, comfortably above those figures. Unless stated otherwise, the specifications quoted here come from the manufacturer's listing, cross-checked against retailer listings. The currents are calculations, set out below, not measurements. ## 21700 or 18650, two formats for one bay Voopoo lists both formats, but they do not sit in the bay the same way. The 21700 is the native size, while the 18650 needs an extra part. ### The 21700, the size the chassis is built around The numbers in the name describe the cell, 21 mm across and 70 mm long. A 21700 drops straight into the bay of the Voopoo Drag X Pro with nothing added. It is also the format that holds the most energy for comparable cell chemistry. Its volume is about 47% larger than an 18650's, from the simple cylinder sum (10.5 x 10.5 x 70, against 9 x 9 x 65). ### The 18650, with an adaptor Several retailers list an 18650 adaptor among the box contents, whereas Voopoo's packing lists show none and its page only mentions a removable battery compartment. It is worth checking for it when the box is opened. The adaptor holds a thinner, shorter cell steady in a bay designed for a 21700. That option mainly suits vapers who already own 18650s, with a smaller energy reserve as the trade-off. Our comparison of [21700 vs 18650 batteries](/uk/21700-vs-18650-batteries/) explains what those few millimetres change. ## Voopoo Drag X Pro amps, from SMART mode to RBA mode On a regulated mod, the coil does not set the current drawn from the battery. The displayed wattage, divided by the cell voltage, decides it, and the kit's two main modes set the bar in different places. ### In SMART mode, an 80 W ceiling SMART mode, shown by a yellow screen, recognises the fitted coil and sets the output within its range. A retailer and a review site both state that it tops out at 80 W. At 80 W, the cell supplies about 22 A at its nominal 3.6 V (80 / 3.6) and 25 A once it has dropped to 3.2 V (80 / 3.2). The full reasoning sits in our guide to [vape wattage from the battery side](/uk/vape-wattage-and-batteries/). ### In RBA mode, the whole range up to 100 W RBA mode, on a blue screen, lifts that ceiling and opens the full range of the Voopoo Drag X Pro, up to 100 W. One retailer's tutorial reserves it for experienced users. It is also the mode that works the battery hardest, with about 28 A at 3.6 V (100 / 3.6) and a little over 31 A at 3.2 V (100 / 3.2). ### Current coil by coil Voopoo publishes a wattage range for each of the four TPP coils that fit the pod. The table takes the top of each range and the current it asks of the battery, before circuit losses, which push the result up slightly. | TPP coil | Resistance | Stated range | Current at 3.6 V | Current at 3.2 V | | --- | --- | --- | --- | --- | | DM4 | 0.3 ohm | 32 to 40 W | 11.1 A | 12.5 A | | DM2 | 0.2 ohm | 40 to 60 W | 16.7 A | 18.8 A | | DM1 | 0.15 ohm | 60 to 80 W | 22.2 A | 25 A | | DM3 | 0.15 ohm | 80 to 100 W | 27.8 A | 31.3 A | The DM1 and DM3 share the same 0.15 ohm value, yet the DM3 asks the battery for roughly 6 A more near the end of the charge. On this kit, the wattage range tells you how hard the cell works, not the figure in ohms. ## Which battery suits the Voopoo Drag X Pro The number that matters is not the capacity in mAh printed large on the wrap. It is the continuous discharge rating published by the cell maker, best read on that maker's own datasheet rather than on a retailer's page. Molicel, for instance, publishes for its INR-21700-P42A cell a nominal voltage of 3.6 V, a typical capacity of 4.2 Ah and a discharge current of 45 A, with a maximum weight of 70 g. Against the 31 A worked out for 100 W near the end of the charge, the published figure sits well above that need, even in RBA mode. With an 18650 the method stays the same, but the margin has to be checked cell by cell, because capacity and discharge rating vary widely between models. Any cell whose published rating stops at 25 A is already at its limit in SMART mode near the end of the charge, and is exceeded in RBA mode. One last check is done by eye before every insertion. A split wrap or a damaged insulator ring around the positive terminal is enough to set a cell aside, whatever its discharge rating. ## Battery life on the Drag X Pro, the watt-hour sum Battery life on a mod is a question of energy, not milliamp-hours. A 4.2 Ah cell at a nominal 3.6 V stores about 15.1 Wh (4.2 x 3.6). That energy is spread over cumulative firing time, meaning the total number of seconds during which the coil is heating. At 40 W, with a DM4 at the top of its range, 15.1 Wh amounts to about 23 minutes of cumulative firing (15.1 x 60 / 40). At 80 W the same cell falls to around 11 minutes, before the chipset's conversion losses. Doubling the wattage therefore halves the reserve, whichever format you use. Our guide to [vape battery life](/uk/vape-battery-life/) runs the same sum for other set-ups. ## Charging through USB-C or on an external charger The Voopoo Drag X Pro charges through a USB-C port rated at 5 V and 2.5 A, or 12.5 W of input. The manufacturer publishes neither the current actually sent to the cell nor a charging time, so this guide does not offer one either. That built-in port is handy, but a removable cell opens a second route, the external charger. It charges the cell outside the mod and, on models with a screen, shows its voltage, which helps spot a battery that no longer climbs back to 4.2 V. What to look for in one is covered in our [vape battery charger guide](/uk/vape-battery-charger-guide/). ## The TPP-X pod and the UK 2 ml limit Many listings quote 5.5 ml for the TPP-X pod. That figure describes the standard version, whereas UK rules cap refillable tanks at 2 ml, so a UK listing should show the 2 ml capacity. On the same rules, nicotine e-liquid is limited to 20 mg/ml and sold in bottles of no more than 10 ml. Through a separately sold PnP cartridge, the pod also takes the brand's PnP coils, whose ranges go as low as 10 to 15 W for the 1 ohm PnP-R2. On the battery side, such low outputs change everything, with under 5 A asked of the cell (15 / 3.2). ## FAQ Five hands-on questions that spec sheets tend to leave out. ### How do you fill the Drag X Pro pod? It fills from the top. Pressing the button on the cap frees the top ring, which you rotate to uncover a silicone plug. Lifting that plug gives access to the fill hole. ### Which e-liquid suits the Drag X Pro? Voopoo recommends e-liquid at 10 mg/ml of nicotine or less for all four TPP coils. Those coils are designed for direct-to-lung vaping. For mouth-to-lung vaping, the listing names the PnP-R1 and PnP-R2 coils, fitted in the PnP cartridge. ### How do you switch the Drag X Pro on and off? Five quick presses on the fire button turn the mod on or off. A switch below the adjustment buttons can also act as a power switch, or lock the buttons, depending on the option chosen in the menu. ### Which coils come with the Drag X Pro? The box holds two TPP coils, a 0.2 ohm DM2 and a 0.15 ohm DM3. The DM1 and DM4 are sold separately. ### Does the Drag X Pro fire when you inhale? Yes. The manufacturer lists a manual mode, using the button, and an automatic mode that starts heating when you draw. Both options are available on the same mod. ## Voopoo Drag X Pro, choose the battery before the wattage The **Voopoo Drag X Pro** is judged first by the cell you put in it. In SMART mode it asks for up to 25 A near the end of the charge, in RBA mode a little over 31 A, and only the battery maker's datasheet tells you whether the margin is there. A 21700 with a published discharge rating well above those values, an intact wrap and a 2 ml pod make a sound base for a kit that reaches 100 W without pushing its cell to the edge. Reading a mod through its battery remains a good way into sub-ohm hardware as a whole, and it is the thread this site follows. Editorial content for adult readers only. Nicotine vaping products are not for sale to anyone under 18 in the UK. Vaping products can contain nicotine, a highly addictive substance. This article is not a buying recommendation.