I've been on a "learning bender" the last week regards how to care for my LSD NiMH cells (= Eneloop, Duraloop, others), which are currently the "go-to" type of rechargeable AA and AAA cell on the market. I'm not the world's expert on this, but I have studied and learned the following: - Stockpiling Eneloops (or other LSD NiMH) takes a little maintenance. Can't just throw them in the drawer and expect to recharge when needed. Neither can you expect the stock charger to keep them in good shape. - Buy as many as you can use, but not more than that. Or you'll just have a maintenance task on your hands. - The capacity of a seldom-used or stored Eneloop will be down to half capacity in a few years. Regular use keeps them healthy. But even regular use needs the occasional "Refresh & Analyze" cycle to redistribute electrolyte. - You can (usually) get (most of) that capacity back with a smart charger. - The two smart chargers most frequently recommended for NiMH AA and AAA (and maybe up to D? Not sure) are the Maha C-9000, and the La Crosse BC - 900. I purchased the former due to slightly more recommendations on CPF. - Smart chargers have these "conditioning" cycles, "refresh & analyze" cycles, or a really thorough one called the "break in mode" (BIM). The BIM will trickle in an overcharge, then drain it out, then trickle it back in, over the course of two days. This process redistributes the electrolyte and gives most your capacity back. Oddly the overcharge does not harm the cell due to the very (agonizingly) slow rate it is trickled in. - You should BIM lightly-used Eneloops every 12 months and BIM stored Eneloops every 6 months. (Oops. I'm now reviving cells I bought in '07!) - Eneloops are best stored at 60% capacity or thereabouts. So if you're really neurotic, after you BIM, you run a discharge cycle till the cell's down to about 1100-1200 mAh, then store in a cool place. Opinions split on whether refrigerator is good idea or not. Not necessary. That's the basics of what I learned, hope it's helpful to someone. Apologies to all of you who already knew this. And further apologies if any of it is incorrect, please chime in if so.