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MecArmy B18 Battery Case - Fits 6 x 18650

Closed Case
Case on its Side
Open Case
Case With Batteries
Case Covered In Water
Closed Case
Case on its Side
Open Case
Case With Batteries
Case Covered In Water
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MecArmy B18 Battery Case

Different Kind of Battery Protection

Keep your spare 18650s safe and secure with the MecArmy B18 Battery Case! This durable polycarbonate container is able to house up to six 18650 Lithium Ion batteries, making them safe and easy to store or carry with you wherever you go! The B18's lid screws on tightly and is padded on the inside to provide extra cushion for the cells. The battery case is incredibly impact resistant and is completely waterproof when sealed, allowing you to bring your spare power sources just about anywhere safely!


  • Holds up to six 18650 Lithium Ion batteries
  • Made from high-strength polycarbonate plastic
  • Lid screws on tightly to keep out any dust or water
  • Foam padding on inside of lid to protect batteries
  • Protected from drops up to 2 meters
  • IPX-8 water resistance (waterproof and submersible up to 2 meters)
  • Dimensions:
    • Height - 3.23" (82 mm)
    • Diameter - 2.79" (70.9 mm)
  • Weight: 2.45 oz. (69.5 g)
15 Reviews
80% (12)
20% (3)
0% (0)
0% (0)
0% (0)
By Mike B.
Sturdy Storage
December 21, 2020
This case is built solidly and seals tightly. You can't stack it like you can the flat rectangular cases, but it would be fine for dropping in a backpack.
By KuroNekko
18650 battery case
December 2, 2020
Holds six 18650 batteries securely. Comes with a fitted foam insert under the cap. It's loose when there are no batteries but when the batteries are loaded, prevents them from moving thus creates a solid and stable housing. Fits all kinds of 18650s; protected or not. The plastic of the case is smoked so you can see the batteries inside. The case also comes with a lubed O-ring so the case should be waterproof. Overall, a great case for the adventurer who needs a dependable, durable, weatherproof case for batteries.
By Mountain M.
Works well for the intended purpose and more.
November 30, 2020
These are a secure way to carry your 18650 batteries. It will also hold various other items as well. It is weatherproof/waterproof enough for almost any use other than completely submerging it deep for a long period of time. It has never failed me in any way so far. If you have an extra conversion sleeve for CR123 sized batteries for your 18650 light, they will fit in here also, along with a small USB charging cord, etc.
The top foam padding is not secured in the lid and can fall out, but is easily remedied with a small piece of double sided tape.
A good product, and I recommend it.
By Jack
November 25, 2020
These are great, I can't wait to try 21700s in them! If they fit, looks pretty close.
Valley Park, MO
October 17, 2020
Almost identical to similar Surefire CR1233 battery case (Very high quality) except for 18650. Very happy with purchase.
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MecArmy B18 Battery Case - Fits 6 x 18650

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