Here’s an idea to store two of the coin size CR2032 batteries in a small waterproof & crushproof container. I use the CR 2032 batteries in an Aimpoint Micro T-1 and even though the batteries are supposed to last a “long time”, I know they will fail at a bad time, so the trick to keep them handy without ruining them. This is a pretty simple idea but I wasn’t sure everyone could understand my southern accent, so I put pictures at the bottom. 
I used the cheap Contact Lense Cases from Wal-Mart (or Walgreens). These are the two screw-top containers in one housing. The inside of the container is just a tad wider than the 2032 batteries and two batteries will fit with a little bit of slack. It will probably hold more of the 2016 batteries, if that is what you use.
You can leave the containers connected but I want to have two containers. To separate the containers, I used a pair of Utility Shears. The next time, I’ll use a hacksaw or coping saw because I think I’d get a smoother cut. The Shears separated the containers but it was more of a “controlled break” with irregular edges.
Next, I sanded the edges. You want to leave small tab(s) to help hold the bottom half of the container. I sanded one where it was completely round and I almost could not open the container because it just turned in my fingers. The top has grip serrations to hold but the bottom doesn’t have anything, so you need to leave something to help hold it.
I used foam weatherstripping to keep the batteries from moving and rattling. I had round foam weatherstripping but square or rectangle would work, just cut two 1/8” thick pieces about ½”- ¾” in diameter. Take the clear plastic packaging that covered the batteries and cut the round part that was over the battery (it is the perfect size) to get an insulator between the batteries. You theoretically shouldn’t need it but I didn’t want to take a chance of having dead batteries in 2-years. You could also use a piece of paper, tape, etc. but I figured if the manufacturer uses it, it should be a good insulator.
I put the pieces in the container in this order: a piece of foam in the bottom of the container, a battery with the small side down (+ side up), the piece of insulating plastic, a battery with the small side down (+ side up), and then a piece of foam.
Then, I screwed the lid down. You really have to get it tight and you’ll see why you need the tab. Make sure the gap between the top and the bottom, is the same all the way around. If you have more gap in one area, try and push it closer together while tightening some more. I think if you left the two halves as one unit, it would be easier to tighten because there is more to hold on to. When you have it tight, you can press in on the center of the top and feel it has a little give, so you know you’re not crushing the batteries. I used a fine tip Sharpie to write the date I closed the containers and the size batteries that are inside.
I tried to fit container in my MIAD grip and it fit but it was a pain to get out and there’s not room for anything else in the grip. So, this idea is probably just a good way to keep a couple of batteries waterproof and crushproof in a bugout bag or handy in a utility pouch.
