Let me tell you about these little powerhouses – the Duracell CR2 3V Lithium batteries. I've been using them in my security cameras and they've been running non-stop for over a year now. That's some serious staying power!

The best part? These batteries work in all sorts of devices – from garage door sensors to dive computers. I was surprised to find how many of my gadgets actually use this size. It's like discovering a secret battery that powers half your house!

Now, about that 10-year storage claim... The expiration date on my pack showed about 6 years, which was a bit disappointing. But hey, even six years is pretty impressive for battery storage.

Word to the wise though – don't count on fast delivery if you order these online. My package took way longer than promised. Better to stock up before you actually need them.

Price-wise, they're a great value considering how long they last. I did the math – at just over $1 per year per battery, it's hard to complain.

One thing I really appreciate is how well they handle extreme temperatures. My neighbor uses them in his desert home where temperatures swing from scorching hot to freezing cold, and they still last years.

The only real downside? They can be hard to find in local stores sometimes. But when you do find them, grab a few packs – trust me, you'll thank yourself later when your gadget keeps chugging along while others would have died months ago.