Pulsar 510 DL Tandem

The Pulsar 510 DL Tandem does something unusual in the 510 space: it puts two 510 connections into a single battery. One 650mAh cell powers both ports, and you can keep two cartridges mounted at the same time. That's the entire concept, and it's a genuinely clever one for the right user. If you regularly switch between two different cartridges — different strains, different formulas, different viscosities — the usual routine is unscrew, pocket one, thread on another. The Tandem eliminates that entirely. Both cartridges stay attached; you just choose which is active. Conduction heating runs at the same ~3-second warmup as the rest of the DL line. Build quality is solid aluminum, USB-C charging, and Pulsar's standard one-year warranty. For anyone using a single cartridge at a time, the Tandem is oversized and unnecessary — the Centro or Scribe makes more sense. But for dual-cartridge users, it's one of the few 510 batteries on the market that actually addresses the switching problem directly. The form factor is larger and visually distinctive; this isn't a device you'd mistake for something else. If you want discretion, look elsewhere. If you want convenience and you're the kind of person who carries two cartridges anyway, the Tandem is a smart buy that simplifies your daily carry in a meaningful way.