I buy a couple of bricks of AA alkaline batteries when they go on sale, and store them in a cool place with my emergency food and water cache. I have converted most of my emergency electronics to AA size for this reason. I have head lights, two way radios, AM-FM radios, several different flashlights in my kit. I use these batteries as needed, and when they go on sale again, I buy more. I do the same with stored food, using it as needed and then replenishing when it goes on sale. The advantage of this is that all of my supplies are relatively fresh, the problem is that I sometimes get lazy (or cheap) when it comes to replenishing things I have used, so there can be an ebb and flow in the quantity of supplies on hand. I am trying to think of a better way to organize so my overall supply level remains fairly high, but still in rotation. I would hate to get into a situation where an emergency developed, and all I had left in my cache was an 8 year old case of canned rutabegas.