How long do enloops last, I had a few for a few years, im sure charge doesn't hold up as well after awhile.
I bought an 8 pack and a charger in late 2006 for my 360 and Wiimotes. Four of those still work well. I added eight more in 2011. Only 1 of those has died. I use markers and mark them in pairs. My A pair, B Pair, etc. so I always use the same two together. From my first batch both "B's" are dead and I have an "A" and a "C" paired now because their mates died. From the second batch one "F" hasn't been used since the other "F" died and none of the others have died yet.