I probably have around 100 NiMH AA batteries at home, around 30 AAA ones, most of them are Eneloops, around 20 are Energizers and around a dozen are some misc.

I probably have around 100 NiMH AA batteries at home, around 30 AAA ones, most of them are Eneloops, around 20 are Energizers and around a dozen are some misc. brands. Most of them time they are good but still a couple of Eneloops died just around 5 years. Moderate leaks but did not cause any trouble. Seemed to be caused by the fact I left them in toys and let them run flat for fairly long time(not sure how long, but should be less than a year). In the same period, I threw away double the amount of other brands ones. Most of the rechargeable ones are still going strong. I do observe a few of them are pretty weak and most likely going to die in a couple of months. In general, the cost to use rechargeable ones are only 1/4 to 1/3 of alkaline ones. The only things is that some of the appliances does not like NiHM batteries. I'm no saying NiMHs do not work at all but rather they stop working with around 75% charge left, which is quite annoying. I use alkalines with them if I observe such behaviors.