3.7 Volt 21700 Rechargeable Battery Flat Top Battery 2 Pack Large Capacity Batteries for LED Flashlight, Headlamps, etc

Using this 5000mAh 21700 battery in my high-lumen flashlight has been a game changer. The extended runtime is immediately noticeable — I get several long sessions out of a single charge, even on turbo mode. It fits snugly and works perfectly with my light’s onboard charging system without any issues.The build quality feels solid, with no cheap wrap or loose terminals. I’ve used it in both hot and cold conditions, and performance has remained consistent. Great for camping, night work, or emergency kits where reliability really matters. Holds a charge well even after sitting unused for a few weeks.

Very nice charger that small enough to fit in the suit case for travel or on a stand

No positive or negative feedback on the product. I bought this battery as a replacement for a TrustFire T40R flashlight. This battery is a bit shorter, but more importantly, does not have a button on the + that the flashlight needs to make contact.

Good recharge battery . Holds a charge for and acceptable amount of time in my flashlights. Will purchase again. Worth the price.

I brought this to replace my doorbell battery. Like another user posted, they gotten like half the usage vs their old battery. I can confirm this is accurate. My old battery last at least 30 days before needing to recharge. This brand new replacement last 15 days. I question if this is even 5000mAH? of course its too late for return as it past the return window. I would not recommend this brand.

These are slightly oversized and may cause fitment issues in some devices. Additionally 3000mah seems more accurate than the advertised 5000mah.

I purchase several things on Amazon and was giving pretty in-depth reviews. From this point on, here's the new agenda…. if it works as advertised, is well made, meets or exceeds the description, is a value, and arrives in a fair amount of time, it will get a "star rating" equal to what my expectations were/are. If it doesn't meet these criteria, then I will most definitely and descriptively tell the short comings of the products and you as a consumer will not have to go through the trouble of buying the product without some background knowledge. If the sell pulls that item and relists under another description, I will put the exact same review on the seller's feedback page. Sellers have done this a couple of times in the past, and I was true to my word then as well as now. DR

These batteries work great but I gave it a four-star rating because the wrap on them came off fairly quickly compared to most of my other batteries. Given I use them daily or around about that much. I alternate them with another set. But they do hold charge well and work perfect for what I need them for. Just wish I didn't already have to buy wraps