Okay, so I finally found THESE little lifesavers after my kid's musical book turned into a silent novel. Stores never seem to carry AG10 batteries when you need them, right?

The package arrived with 20 batteries neatly packed - way more than I needed but hey, now I'm set for years! Popped one in and BAM, instant twinkle-twinkle-little-star action.

What surprised me most? These actually last! My laser pointer's been going strong for months now. No more 'battery chicken' where I wonder which device deserves the last good battery.

Pro tip: They work in everything from calculators to medical devices (yes, I tested in my thermometer). The blister packaging makes them easy to store without losing any - no more battery graveyard in my junk drawer!

Shipping was faster than expected too. Definitely beats driving around town searching for these obscure button cells. Will be ordering again when my stock runs out... in like 2030 probably.