If you put loose batteries in a bag, whenever a positive pole contacts a negative pole both batteries will discharge and die. If you try to keep them in the original packaging you find it's too flimsy and once half empty the batteries slide around in there anyway risking discharge. I've taken to taping them together and covering the poles with tape to prevent all this, but it's a serious hassle. Does anybody make a carrying case to hold fresh batteries properly?
9V, I assume? How many you need to carry? I think you need something like this: They make little flat plastic cases for organizing a variety of other things. I'd take some batteries with you to the store. Look at dept stores where they sell organizing stuff, or a trip to the arts and crafts or places that sell fabric.
9v and AA are my immediate needs. Mostly AA since my wireless eats them up pretty fast. That's a good idea about the organizer boxes.
Camera stores have them, sized specifically. Hobby shops catering to rechargeble R/C things probably would also. Here's some examples, not as "the thing you want" but as "a place to start, and look at other related items to see if you find the one you want." Hard plastic and soft(fabric) variants exist at a wide range of price points. http://www.adorama.com/HAHKBCS.html http://www.amazon.com/Bluecell-Battery-Storage-Organizer-Holder/dp/B0079UVYI6 http://www.amazon.com/Storacell-Powerpax-Battery-Caddy-Yellow/dp/B004YG7JXW/ref=sr_1_2?s=electronics&ie=UTF8&qid=1374627954&sr=1-2&keywords=battery+case Fabric ones are also an easy project if you know anyone (or are someone) who sews. Little pockets and a flap over the open end.
Some batteries come with plastic things clipped over the terminals. Maybe there is some place to buy them in bulk.
I usually get a 2 pack of 9v batteries - take one out of the packaging & cover the back of the packet with gaffa.
how do you figure they're almost impossible to short out? all you need is for two of them lying in the bottom of a ziploc bag to touch one's + end to the other's - end. Not unlikely at all.
+1. This cannot discharge your batteries. That's the way they go in a flashlight, right? And they don't start to discharge until you turn the light on.