Birdz 2 Black 18650 & CR123A 6 Battery Holder Storage Case for 18650 Batteries

I bought these in clear on a different listing so it won't show me as a verified purchaser but I thought I'd copy my review here if it helps someone:These are great. They are not waterproof (I wouldn't call them water resistant either) but for reasonable home storage or on-the-go packing where they aren't getting mashed about, they're nice cases. The hinge strip is a bit thin and the latch isn't real robust, but it all works. There are short dovetail connections front and back, so you can mate together any number of cases to keep them together or add stability when stood vertically. If the hinge separates down the line, I can live with that since these will live in drawers and on tabletops for my needs. I think this is the best 6-cell case I've found. It's still very compact, just very slightly longer/taller than the plastic racks that are sold for pack building, etc. and it's much better than the couple of box-case designs out there.*** NOTE ON SIZING: All batteries are not the same length. Straight from the actual factories, 18650 cells are generally +/- 0.3mm from the spec standard 65mm, depending on who's making them. Once you add a raised top or a button top to a factory cell - your battery grows in length. Add a protection circuit or onboard usb charging - your battery grows even more. Measure what you have (use tape to cover steel caliper jaws or use non-conductive calipers so you don't direct-short the cell, if you're not just using a decent ruler).* If you look at the photos, you'll see a rectangular box under the lid. That extends lower. It covers the four slots in the center. The outer slot on either end has more capacity for cell length.* The maximum cell length for the center slots under the rectangle thing is 67.3mm. That fits the few unprotected button top cells I have nicely (so those could be used in all six slots).* The maximum cell length for the end slots is 69mm. I have some EVVA protected button tops that are 69.1mm and they still fit in those two slots but there is a very slight gap in the lid...still latches securely, though.If you use standard unprotected flat-tops or button-tops, no worries at all from any brand. If you use protected cells or usb-port cells then measure them first.

Batteries do not fit unless you push down on them hard enough to deform the case. Not worth it.