Streamlight 22104 SL-B26 USB Rechargeable Lithium Ion Battery 3.7V 2600mAh X Series Dual Fuel Flashlights, 2-Pack

So far, so good the batteries last quite some time and make my flashlight super bright on the flipside. They do take quite a long time to charge, but that’s very small sacrifice for the performance of the batteries. I actually have a charger that I put them in I have not tried the plug-in Aspect of these batteries so I can’t comment on that but they charge well. They last quite a while and they put out the juice.

They do take a while to recharge but last a long time between charges. I use my light in my work and it is used a lot , the last set of batteries I had are 5-6 years old and one is still working although doesn’t last as long as it used too. Did buy again, good product

Works as expected

This is my favorite rechargeable Lithium battery to use for my LED flashlight and for use to recharge my cellphone battery.

You'll discover the most affordable option, but some batteries may die within a month. I have a Wuben flashlight, and it performs better. Streamlight is always a trusted brand in the flashlight industry.properform better than other cheap optionand this is made in Taiwancomes in 2 batteries.ConExpensive

I picked up this 2-pack of Streamlight SL-B26 batteries for my ProTac HLX, and so far, they have performed really well. The fact that each battery has its own built-in charging port is a huge convenience—no need for a separate charger, just plug them in directly!Pros:✔️ Built-in USB charging – No need for an external cradle, just plug in a micro-USB cable.✔️ Good battery life – Lasts a long time in my ProTac HLX, providing reliable power for extended use.✔️ Dual Fuel compatibility – Works seamlessly with Streamlight’s X-Series flashlights.Cons:❌ No USB-C – At the time of my purchase these are still using micro-USB, which feels outdated. A USB-C port would have been more durable and future-proof.Final Thoughts:This is a solid rechargeable battery pack that eliminates the need for disposable CR123s. The convenience of direct charging and good battery life make it a great upgrade for Streamlight flashlight users. The only downside is the lack of USB-C, which would have made charging even better.⭐ Would I recommend it? Yes, absolutely—just be ready to keep a micro-USB cable around!

Pretty good and still have it after 4 yrs with it.

This was a great find to have a rechargeable battery for my primary on-duty flashlight that holds a charge for a long time, easily recharges with a USB cable, and is lightweight. Not having to buy and stock lithium batteries is huge: that adds up cost-wise and isn't very good for the environment. Just make sure the battery compartment in your light is wide enough: it fits my ProTac HL-X aluminum frame light perfectly (designed for), but it is slightly larger diameter than CR123A lithium batteries so it does NOT fit my older PolyTac LED Streamlight despite it otherwise running on two identical batteries as the ProTac.