Description
Running a high-output flashlight means carrying a spare, and tossing a loose 21700 into a pocket or pouch is asking for a dead cell or a damaged battery right when you need it. The Thyrm CellVault-21 in Flat Dark Earth solves that with a rugged, double-wall container that holds one 21700 rechargeable battery, or a single Streamlight SL-B50 once you pull the foam insert. An O-ring seal gives it an IPX7 rating, meaning it stays sealed down to 2 meters for 30-plus minutes, so rain, creek crossings, and a dunexpected dunk won't touch your power source.
What the CellVault-21 Brings to Your Kit
Inside the tube sits a silicone foam shock absorber that cushions the battery and cuts down rattle and noise signature. Clear polycarbonate windows on each side let you confirm what's loaded without cracking the case open, which is handy when you're sorting charged cells from dead ones in low light. It's a small detail that pays off in the field.
Mounting the CellVault-21 on Your Gear
This version carries over the dual-wall build and side windows from the popular CellVault-18 but steps up to the larger 21700 capacity along with an upgraded latch. That detachable metal latch threads easily through tight MOLLE and PALS webbing, and if you want extra insurance, there's an included security pin that locks the latch to the back strap. At less than one MOLLE column wide, it tucks neatly between magazines, med kits, radios, and other first-line gear without crowding anything.
Built in the USA
Thyrm injection-molds, assembles, and packages the CellVault-21 in the USA, and designs its products alongside military, law enforcement, and other high-risk users. The Flat Dark Earth finish blends in with earth-tone loadouts, and the slim, lightweight profile makes it just as at home clipped to a plate carrier as it is riding in an EDC bag or survival pack. Note that no battery is included, so pair it with the 21700 or SL-B50 you already run.
Key Specifications
- Manufacturer: Thyrm LLC
- Manufacturer Part Number: CV21004
- UPC: 765855322287
- Color: Flat Dark Earth (FDE)
- Battery Compatibility: One 21700 rechargeable battery or one Streamlight SL-B50 (foam removed)
- Waterproof Rating: IPX7, O-ring seal rated to 2 meters for 30+ minutes
- Construction: Dual-wall injection-molded plastic
- Windows: Clear polycarbonate side viewing windows
- Interior Padding: Silicone foam shock absorber and noise silencer
- Mounting: Detachable metal latch for MOLLE/PALS webbing, belts, and backpack straps
- Profile Width: Less than one MOLLE/PALS column wide
- Country of Origin: USA
What’s Included
- Thyrm CellVault-21 battery storage case (Flat Dark Earth)
- Detachable mounting latch with back strap
- Metal security pin
- Silicone foam shock absorber insert
Frequently Asked Questions
What batteries does the CellVault-21 hold?
The CellVault-21 is sized for one 21700 rechargeable battery with the foam insert in place. Pull the silicone foam out and it will also fit a single Streamlight SL-B50 battery. No battery is included with the case, so you'll want to supply your own.
Is the CellVault-21 actually waterproof?
Yes. It uses an O-ring seal rated to IPX7, which means it stays sealed at a depth of 2 meters for more than 30 minutes. That covers rain, splashes, creek crossings, and an accidental dunk without soaking your battery.
How does the CellVault-21 attach to my gear?
It uses a detachable metal latch that threads through MOLLE or PALS webbing, belts, or backpack straps. The latch upgrade makes installation easier on tight webbing, and you can lock it in place with the included security pin for extra hold. At less than one MOLLE column wide, it won't crowd out your other first-line gear.
What's the difference between the CellVault-21 and the CellVault-18?
The CellVault-21 shares the same dual-wall construction and side viewing windows as the CellVault-18 but holds the larger 21700 battery. It also features an upgraded latch that installs more easily on tight MOLLE and PALS webbing.




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