Battery Storage Case Plastic Waterproof Battery Holder 18650 Battery Case 16340 Case(4 Pack)

I got these because they have a seal that helps keep moisture and dirt out while they are in my emergency bag. I put 18650 & 18350 batteries in them and they fit just fine, plus they locked up just fine. They worked with button top 18650 & 18350 batteries.

Good product. Keeps 18650's secure

For context I purchased these to hold extra batteries for caving. As such my batteries functioning could, in an extreme situation, be the difference between life and death. I understand that this is an extreme use case and that is why I still look upon the product somewhat favorably despite finding it (partially) inadequate for my use.Compatibility: These have worked with all the 18650 cells I’ve tried. Longer protected cells fit particular well with shorter unprotected cells sliding back and forth. It also worked with my fatter 3400 mA h batteries so there’s no issue with width.Waterproofing: I tested the case for waterproofness with a paper towel under running water and submerged from all angles. The case did prevent water from entering the case however the tabs that hold the case together are inevitably going to eventually wear and break. I’d expect as soon as one side breaks, the uneven pressure on the rubber seal will result in water being able to enter the case when submerged although it should still be able to prevent water that’s sprayed on the case. The rubber seal is also very exposed when opened, and any amount of mud or grit that gets on the seal will almost certainly prevent the container from being waterproof when submerged. Finally, the plastic is cheaper than I hoped and seems like it could crack easily or the edge of the bottom container could chip, once again resulting in a breach of waterproofing.Overall given the price, even though under heavy use this product is bound to have a limited lifespan (in terms of staying waterproof), I think it is still a solid purchase. For the vast majority of applications this case will work well enough. I will still likely use it in drier caves that won’t ever require my pack being partially submerged due to their convenience and light weight. But I’ll definitely stick to Pelican cases for any caves that require swimming.

Bought to support my elementary students.

I'm notorious for buying things on Amazon without reading the description so these ended up smaller than I would have liked but after using them for a few weeks im sold. They hold two 18650's comfortably and seem well made. I arranged charged batteries pos to pos and discharged batteries pos to neg so I can keep track of whats what. I'd buy them again.

Excellent deal, such a sturdy compact safe way to carry my vape batteries around while keeping them paired up. Will buy again as I get more batteries and will highly recommend to friends in the vaping community.

I keep extra batteries in my scuba kit to use for camera strobes. These are great and airtight. You won’t regret buying these!

I use these for holding large USB drives, Proects using the Raspberry Pi Zero w, Various other proects, and sometimes even for holding a couple 18650's. While they are certainly not Otterbox quality, they are very durable. The plastic doesn't shatter when you drop it, and it's at least somewhat waterproof. There's a gasket in the lid, and I haven't had one leak, but I would prefer to consider it water-resistant. I usually by them on Ebay, but found for the same price I can get them in a day on Amazon instead of waiting for a China delivery.