Quick answer
A 510 thread vape battery case holds a battery that uses the 510 connector. The connector measures 7 mm across with a 0.5 mm thread pitch. Case makers list fit by battery diameter in millimeters, not by brand. Buy by diameter and length. A case cut for a 10.5 mm slim battery will not hold a 19 mm battery.
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What the 510 number means
The number comes from a cigarette-style device sold in 2009. The thread is metric: 7 mm outer diameter, 0.5 mm pitch. NIST publishes Handbook 28, a reference set for screw thread standards. The 510 spec covers the connector only. It says nothing about the case, the battery capacity, or the voltage output.
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Sizes to measure
- Diameter. Common battery bodies: 10.5 mm, 11.5 mm, 14 mm, 19 mm, 22 mm.
- Length. Slim pens run 80 mm to 120 mm. Box mods run 70 mm to 95 mm.
- Cartridge height. A 1 mL cartridge adds 50 mm to 65 mm above the battery.
- Charger port. USB-C ports sit on the side or the bottom. A case with a cutout lets you charge without removal.
Case types
- Silicone sleeve. Holds one battery. Adds 2 mm to 3 mm to the body.
- Hard shell with foam. Holds 2 to 6 batteries. Foam cutouts set the diameter.
- Odor-control case. Uses a carbon liner and a zip seal. These cost more.
- Tube or pen case. Holds one assembled battery and cartridge. Length runs 150 mm and up.
Checks before you buy
Read the interior dimensions, not the exterior. Compare the interior diameter to your battery diameter. Leave 1 mm of clearance for silicone sleeves. Check the insert material. Foam holds shape. Elastic loops stretch and lose tension.
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Check the closure. A zipper with coated teeth resists odor. A snap closure does not. Check the hinge. A living hinge on a polypropylene shell fails after repeated flex. Metal pins last longer.
Battery safety and storage
Lithium-ion cells can vent or catch fire when the shell is damaged or when the terminals touch metal. The US Fire Administration reviewed e-cigarette battery incidents and reported that many started during charging or when loose batteries contacted keys and coins. A case with separate slots keeps terminals apart. Do not store a bare battery in a pocket with metal.
Remove the cartridge for long storage. Heat above 30 C (86 F) shortens cell life. A closed car in summer passes that number.
What is not known
No published standard covers 510 battery case dimensions. Case makers set their own sizes. A case labeled universal fits a range the seller picks. Measure your device before you order.