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The Smyle Penjamin is a 510-thread vape battery built into a working ballpoint-style pen, so it looks like ordinary stationery in a bag or pocket. It adds adjustable voltage and a preheat function, which many basic pen-style batteries lack, and accepts both 0.5g and 1g cartridges via the included adapter. It suits people who want a discreet battery that also writes, though it is a niche design rather than a performance standout.
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This is a 510 cartridge battery built into a pen that also writes with ink. Its design looks like a traditional pen. The cartridge is not included.
The battery has adjustable voltage and a preheat function. It works with 1g and 0.5g cartridges, and a 0.5 cartridge adapter is included. It recharges through a Micro-USB cable.