Let me tell you about my love-hate relationship with niche batteries. When my hallway light timer started acting up, I realized how hard it is to find decent CR2 batteries locally. Enter Duracell's CR2 - it's like finding a reliable friend in a zombie apocalypse.

The first thing that struck me was how these little power cubes outlasted my previous no-name brand by months. My timer now flips lights on/off like clockwork, even during brutal temperature swings (my garage sensor survived 110°F summers!).

Pro tip: Don't be fooled by the '10-year storage' claim - mine had a 6-year expiry date. Still impressive, but set realistic expectations. Also, Amazon delivery can be... adventurous. Mine took a scenic route across states before arriving.

What really won me over? Using these in my dive computer. When you're 60 feet underwater, you want reliability that won't quit - and Duracell delivered (pun intended). The peace of mind knowing my gear won't die mid-dive? Priceless.

For specialty devices where battery changes are annoying (looking at you, hardwired alarm systems), these lithium warriors are worth every penny. Just buy them before you actually need them!