Button Top 18650 Rechargeable Battery 9900mAh High Capacity 3.7 Volt Rechargeable Battery for Headlamp, Flashlight 241019-3S (Button Top, 8 Pack)

I have not attempted to assess the performance of these batteries, though I have to wonder about the claimed 9900 mAh rating. That's a lot more than many of their competitors; maybe these use plutonium? The one aspect of these batteries which I have been able to test is their size. An unfortunate trend in battery technology seems to make them just a little bit bigger, as a means to increase capacity. The unfortunate part is that they sometimes do not fit well into devices for which they were purchased. Happily, these batteries fit well into everything I've tried.

1st package sent by Amazon was left outside, uncovered, during a rainstorm... In their paper packaging. Contacted customer service to return and they directly took care of it and replaced the product in 48h. Exceptional.The batteries are being used in a small solar project to teach the kids about the sun and electricity. Works great.

Sip son buenas

These batteries do not charge anywhere near the advertised capacity. Very disappointed with the product. Buyer ended up giving me a refund. Initially they only offered me half the amount which is still absurd. These charged to 520-560 mAh. At this point I do not forsee even being able to use these.

They work as they should.

I have ordered these before. Great battery life, will continue to use this brand

Excellent batteries

Esch individual purpose is different according your usage. They works very well