Welcome back! We saved your shopping cart for you: View Cart

MecArmy B18 Battery Case - Fits 6 x 18650

Closed Case
Case on its Side
Open Case
Case With Batteries
Case Covered In Water
battery case alternate view 4
Closed Case
Case on its Side
Open Case
Case With Batteries
Case Covered In Water
Click to Enlarge Image
Usually ships the next business day
Battery Junction Wholesale Account Signup
Battery Junction Free Keylight On Purchases Over $20 Promo

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)
18 Reviews
83% (15)
17% (3)
0% (0)
0% (0)
0% (0)
By Christopher
Temple, TX
Love this
September 1, 2022
Great product I have multiple of these cases I keep them in multiple gear bags that may find themselves in austere environments.
Almost perfect
August 31, 2021
I have 3 of these cases now. Getting ready to buy another couple after harvesting some more 18650s. I night hike quite a bit with a couple of different Fenix headlamps that run 18650s so one of these rides in my backpack 24/7 and I don't have to worry about my backup batteries getting wet, dirty, damaged or shorting out on something. Fits both my protected and flattops perfectly.

Wish the foam insert came permanently attached but I can fix that myself.
By Bart F.
August 27, 2021
I have 6 of these now. They're thick and durable, but light and compact. Well sized for a cupholder, saddle pocket or backpack pocket. I haven't tested, but I'm very confident in water resistance and shock response. These have made a lot of night adventures very fluid, and extended work shifts easier. Every Mecarmy product I own has been worth its price 10x over.
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.
Related Items

MecArmy B18 Battery Case - Fits 6 x 18650

  • $7.90
  • & Free Shipping On Orders Over $50
  • In Stock