I’ve been using these Duracell 21/23 batteries in my garage door opener for months, and they’re still going strong. No more awkwardly standing two feet from the door just to get it to work—these little cylinders brought back the ‘remote’ in remote control.

The size is perfect—not so small that you’ll drop them while fumbling, but compact enough to slide smoothly into tight battery compartments. I also popped one into my ceiling fan remote at our rental cabin, and it’s survived a summer of constant guest use without a hiccup.

What surprised me most was discovering how many devices actually use this niche battery size. My neighbor borrowed one for his car alarm key fob, and it worked like a charm. At this point, I keep the 4-pack stocked like a mini power bank for random electronics around the house.

Compared to off-brand alternatives I’ve tried, these have outlasted them by weeks in high-drain devices. The peace of mind from Duracell’s damage guarantee doesn’t hurt either—though I haven’t needed it yet. Pro tip: Mark your calendar when you install them; you might forget when they were new because they just… keep… working.