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MecArmy B18 Battery Case - Fits 6 x 18650

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Case on its Side
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Case With Batteries
Case Covered In Water
Closed Case
Case on its Side
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Case With Batteries
Case Covered In Water
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Everyday Low Price: $7.90
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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)
4 Reviews
75% (3)
25% (1)
0% (0)
0% (0)
0% (0)
By Andrew S.
Overall, not bad
September 11, 2019
I bought this battery case to hold my 18650 vape batteries. I have eight of them, and my vape takes two at a time, so a case for 6 was perfect. I liked that it wasn't the standard "clamshell" style case. The screw-on lid is very sturdy and (in my limited experience) dust- and water-resistant enough. My only problem was that the threads on the cap were WAY too tight--it was challenging to get it on and off. I thought it was stuck shut the first time I tried to take it off! I fixed this by rubbing down the interior and exterior threads with some coarse-grit sandpaper for a few minutes; now it goes on and off smoothly. For the price, that little bit of work was no trouble for me.
By at25526
MecArmy B18 Battery Case
July 29, 2019
great battery case to keep your 18650 batts protected (and to protect against shorting/fire risk). Case is water proof and seems durable. Great deal for less than $8
By Thomas
Reading, PA
Great case
February 17, 2019
Holds 6 batteries in a small space. I like that I can put the batteries button up for charged, button down for discharged. No guessing which ones are good or which are dead.
By Jeff
Alexandria, VA
Great Case For a Great Price
September 19, 2018
There aren't many water and dust-proof cases for 18650 cells. This one is of the highest quality. The seal seems very good, and the cap screws on easily, yet firmly. This battery case will be a vital component among my emergency supplies. I'm grateful to have it, and I think it is a bargain for this price.
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MecArmy B18 Battery Case - Fits 6 x 18650

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