Okay, so I've been using these KAMCY AA batteries for a few months now, and here's the real tea ☕️.

First off - the LONGEVITY is legit. I threw these into my Xbox controller and they lasted through two full playthroughs of Elden Ring (yes, I cried). My old batteries would've died halfway through Malenia.

The leakproof claim? So far so good. I left some in my outdoor thermometer during a crazy rainy season, and no corrosion 👏. Though full disclosure - I haven't tested the full 10-year shelf life claim... because who has that kind of patience?

Price-wise? Absolute steal compared to Duracell. Are they quite as powerful? Maybe like 85-90% there, but at half the price? Worth it for everyday devices.

Weirdest place I've used them: my cat's automatic laser toy. Still going strong after 3 weeks of constant feline harassment.

Only con: They're not rechargeable (duh, it says so on the box). But for single-use batteries? Solid 8.5/10 from me.

Pro tip: Great for holiday decorations! My Halloween animatronics ran non-stop without battery changes 🎃