パナソニック エネループ プロ AA 電池（4本パック）

I keep a set in my car emergency kit, and they still fired up my flashlight after sitting for over a year—holds 85% charge just like advertised. The fact that they work in sub-zero temps sealed the deal for me.

I put a set of these in my thermostat last winter, and they still show full power after months of sub-zero nights. They hold their charge incredibly well when stored, which is a big plus for me.

I've been using these in my wireless mouse and they last nearly a month even with heavy daily use. The lack of memory effect means I can top them off whenever without worrying about degrading the battery life.