ThruNite IMR 18650 3100Mah 15A 1PCE High Drain Rechargeable Battery

Thrunite's products are usually fantastic. I have many of them. Several TN12s, a TN11s, Archer 2A, TN32s and the 4 slot 18650 charger with countless Thrunite batteries. All of these are still operational. some I've had for 3yrs+. I was excited to get the C1 charger and integrate it into my system. Having an extra 18650 battery and charger for my TN12s combined with a portable power bank for my iPhone 6 was exciting. After receiving the product I immediately charged the battery that came with the charger. Then I connected my iPhone 6 and tried to charge it by using the charger as a power bank. It charged my phone for about 10 seconds and then stopped. I tried switching batteries and the same thing happened then I tried several other charging cords all with the same results. I noticed in one of the pictures for the description of the product that there is a black USB detector shown. This did not ship with the product. Not sure if that would affect the power bank feature. I have since return the product back to Amazon and have ordered a replacement to see if the USB detector was missing and if that affects the power bank feature. Update: Replacement works great! Does not come with digital meter shown in pic

I got these (4 of them) 14 months ago and put them in a Fenix Tk75 flashlight.I have not used the flashlight much - just a flash from time to time to show how bright the flashlight is. (I'm pretty sure it would fry a hamburger from across a room.) But I also never recharged the batteries until today. I felt that the flashlight was possibly starting to dim a little.I'm very happy that the batteries held so much of their charge for this long.

Good batteries. At least the ones I received appear to be legit Panasonic NCR18650B (made in Japan) cells with the protection circuit. I say "appear" because I haven't removed the white & red plastic sheath, but I can read some of the text written on the battery cell _under_ the ThruNight branded cover. I haven't actually tested the protection circuit either for obvious safety reasons. :)That said, you're paying a very large premium for the protection circuit (hence loosing one star) since you can get 4 Panasonic NCR18650B's here on amazon for about the same price as these 2 ThruNight branded ones.

It works well but there are a couple of things I don't care for, it got insane hot when I tried charging 3 batteries at 1 amp, I measured over 140 degrees on the back and they said that is normal... oooookkk.... anyway I also wish this charger said the charging rate it was doing like the 2 bank one does. If you're ok with the above I think you will like it as it other wise is as advertised.

So far so good. Look, feel, and perform like top notch 18650's. Using one in my bike-helmet-mounted Fenix PD35 and it's burning up the road on my night time rides. I've annoyed a few people already with the brightness, even though I only have it on the 180 lumens setting. Gave them 4 stars only because I can't rate them on long term usage yet.

Sweet quad charger. Shows voltage on each battery and had a 1 to 4 bar kind of charge progress indicator.One thing that was a bit strange... The first charging slot didn't seem to work when I hooked it up. I stuck a battery in slot 2 and it started charging. Then I tried slot 1 again and it worked great. Never another problem.One slight beef. Has a cool looking blue lit display but there's no way to turn it off, even when you're not charging anything, other than pulling the plug

So far these batteries have worked well. However as with all batteries performance over time is the true measure. These charge easily and have held a charge as well as my other premium batteries thus far. They fit in all of the lights that I have tried so far, which is sometimes an issue with 18650's. Overall I am pleased with these batteries especially a this price point. Will update as needed.

It charges fine, but only 3 out of the 4 bays work. when I put a battery in the 4th, the whole display blinks. I'm not overloading it, it does this when I only put in one battery in that 4th bay.