GRUCORE 18650 Battery Charger Slim 3A USB 2 Ports LCD Indicator Power Bank, 3 Bay

I had a bunch of old vape batteries lying around, so one day I decided to see if there was some kind of charging case I could put them in. I figured there had to be something since most of the higher capacity battery packs are essentially just regular 18650 or other battery wired in to a pack. Didn't take me long to come across this unit, especially since I was only looking at four star or higher results. I was between this one and a four battery case and in the end decided I'd rather spare the weight of the fourth battery.The unit arrived quickly and in great condition. I already had my batteries charged and ready to go, so I spared no time in firing it up. I had no problem, unlike some of the other reviewers, opening and closing the sliding top. For the sake of checking, I use three different 18650's (one samsung flat top, one eastshine flat top, and one generic button top). The unit fired up immediately when the first battery was inserted, so you can use one or two batteries or swap out the duds on the fly if you prefer. The bright green display is easy to read and shows current levels for each battery seperately. It also conveniently shows the voltage output when used as a charger and charge level when used as a charger. Only minor irritations I've had with it so far are: the backlight never turns off (and it's quite bright) and the 1 amp port pushing more voltage to my tablet than the 2 amp port. I'm really glad the display stated as much, otherwise I wouldn't have known. Strangely, the 2 amp port provided more power when charging my phone. I timed the overall charge time for my tab s2 using wall power and than again with this unit and I found that it performs just as well as the wall adapter. I wouldn't buy this unit to charge batteries, simply because the light never turns off and it takes twice as long as a decent 18650 charger like the Nitecore I2.All in all, I'm really happy to have a new use for my old expensive batteries, exactly what I was looking for,

This works perfectly to power a small fan for camping. I use the Lcyyo@ 12pcs 18650 3.7V Li-ion Rechargeable Batteries for Led Flashlight Torch Headlamp, Electric Device inside this charger. The fan runs all night on the three batteries inside this charger. I don't have to worry about charger a regular device charger back up, I can just pop in three fresh batteries each night and charge those back up when we get home. This device is very handy and I would recommend this to anyone. I have charged my phone with this device, as well.

After my 10,000 mah decided to stop charging, I ripped it open and salvaged the 18650s inside. I already have an actual 18650 charger so I can just exchange the batteries when they need to be replaced. I recommend having 6 18650s and getting a charger to hold 6 batteries. That way you can have 3 in the charger and 3 in the power bank. If mine ever breaks I would definitely get another one, maybe upgrade to a 4 battery pack

Worked fine.But after 6 months or so, one slot stopped charging, and the others got slow.Some times, it will show that its charging, and when you come back you will find the screen off, & its not charging.Its nice after all, but would not recommend it.

Before I purchased this product I was thinking, "I wish someone made an external battery that holds 18650 batters"....well guess what? They do, I bought it and I LOVE IT !!! Thank you for making this product...it's exactly what I was looking for !!!

Seems like a great product however I notice the unit shuts down before fully discharging the batteries when used as a power pack. I put in three batteries of the same voltage and one of them drained rapidly and it looks like it will turn off when any of the batteries get below a certain point

I like this product a lot. I use it to charge my batteries for my box mod. It charges then very quickly. Definitely worth it in the end. Have had no problems with it so far.

This thing makes every vape smoker jealous. works GREAT!