3.7V Button Top Batteries USB Rechargeable Battery 3600mAh for Klarus Flashlight (XT11X, XT11GT, XT30R...) (2-Pack)

Well made batteries that are a bit longer than usual due to accurate capacity at 3500 to 3600 Mah, EVEN with the USB Charging port added these batteries range within 100Mah of the actual capacity posted and are a very solid battery for HID Flash lights. I highly recommend these as they truly are a fantastic product. Especially when most similar batteries on Amazon sold claiming over 3000 MAH are false. These are very accurately marked and very easy to use. KEEP IN MIND they are a little longer than the normal 18650, so measure the device they are going into to verify first, as long as they fit you will very happy with them.

These are 3.7V 3600mAh rechargeable lithium batteries that can be charged with micro-USB cable.It came in 2 packs inside a plastic storage case that fits both perfectly and while it didn't come with micro-USB cable, people have plenty of micro-USB cables laying around these days so it's not a problem at all.It's cool that it has micro-USB port on top of the battery so you can simply plugin the cable and recharge these batteries using any standard USB powered port. I have few flashlights that use this size and capacity battery so this will serve as spare batteries to replace while old one is being charged. It's the same capacity in mAh and exact same size so no issue with compatibility. These batteries have many built-in protection and can be recharged over 1500 cycles so should last me lifetime. A great spare batteries to have around for emergency, especially when in outdoor like camping. I appreciate that there's a small LED light that shows in red and green color to indicate whether or not charging is completed.

I use these in a couple of the flashlights I have battery life seems standard from what was in there from the factory. And it is nice that if something happened to my flashlight and I couldn't charge it there is a USBC port on the side of the battery itself very versatile.

Beware other people here saying these batteries fit Ring pathlights "perfectly". That is NOT correct, unless by "perfect fit" you mean jamming them into the battery slot with a hammer and never getting them out again. See the pics attached - the original Ring battery is about 2mm shorter. Unfortunately, if the battery is not fully inside the compartment, you cannot screw the lamp back into the plastic post it stands on. For what it is worth - it does otherwise work.Both batteries (original Ring, and this one) are "18650 Lithium-Ion rechargeable batteries". Not entirely sure how it is acceptable to have this big of a difference in size on what is supposedly the same type of battery. I am also not sure which battery is breaking the standard (the original Ring battery, or this one).(NOTE: I am giving it 5 stars because it would be unfair to rate it anything else - however, I have not been able to use it.)

After about a year, my Ring pathlights stopped working. After making sure that the wifi was working and that the Ring bridge was still functioning, I figure that the battery was dead. However, Ring doesn't sell replacement rechargeable batteries for their pathlights. I assume that they figure people can just buy another pathlight.These 3.7V Button Top Batteries USB Rechargeable Battery 3600mAh fit the pathlights. These batteries aren't cheap, but they are still less than half the price to replace the whole Ring pathlight.

I wanted to use these in my fenix headlamp. One battery would not charge any way I tried. The other charged but lasted about 30% of what a fenix 2600 battery last. These are nowhere near what they are advertised to be.

I ordered these as backups for my Fenix HM650R headlamp. I liked the idea of being able to charge the batteries in my truck without needing a separate charger. I realized they might be a bit longer than a standard 18650 due to the inclusion of the charging port, but most reviewers said their flashlights would accommodate the additional length, so I decided to give these a try.As I was test fitting one into the headlamp, I noticed the fit was extremely snug in the tube - I was still focused on evaluating the fit lengthwise, so I (brainlessly) kept pushing it all the way in. The cap fit on and the light worked, so I was encouraged. Then I took the cap off and tried to get the battery out - that's when I realized what a stupid thing I'd done stuffing that battery into such a tight fit.There was nothing to get a grip on to pull it back out. I tried cutting the visible edges of the plastic label and using them as a handle to pull on, but they just broke. I tried putting a sharp knife into the gap to pry it up little-by-little, but there just wasn't a gap to fit the blade into.So I ended up taking my brand new $100 headlamp and banging it against my workbench to get the battery to start sliding out. It eventually came out far enough to get a grip on it and, luckily, the headlamp absorbed the punishment like a champ.Since I'd already sliced the end of the plastic cover on one of them up, I figured I couldn't return them, so I experimented with just removing the entire plastic cover. That gave it just enough decrease in diameter to fit into the headlamp loosely enough to come back out with a gentle shake. So, in the end, I can still use these, but I had to peel the plastic covering/labeling off so they would fit without issues.Other than the non-standard sizing, these appear to be good quality batteries. I'll update this review if they prove to give poor performance when I really start putting them through their paces.

This battery is a must have for replacing your flashlight battery. It easily charges with a type C charger and allows you to easily charge it with your charger if you have a phone that uses type C charger. It makes the flashlight super bright and allows you to see better. It's very durable and will allow you to have light for longer. Amazing price