Just for the record, I'm using Energizer 2500's myself. I have 2 sets of four. Keep the spares in the bag, and charge the dead set as soon as I get home - same as I do for the camera battery.
Only been using mine for < 6 months in the flash, but I've used them in other stuff for ages (other camera, toys, etc).
I probably change them over every couple of weeks or so, so long-term charge holding in the bag is not really an issue. I think they have to sit around for a couple of months before charge holding is an issue.
Just get a good system going so you ALWAYS have a fresh set waiting, and mark the batteries in sets, so you always keep the same set together. I have dedicated sets of four, and twos for other devices, and each battery is marked with a letter, so I can tell which batteries go together. Fresh batteries are kept in a zip-lock bag (one bag per set), dead batteries left outside the bag, and popped in the charger as soon as I get home. As soon as they are charged, they go back in the zip-lock bag, and back in the camera bag.
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