NitecoreUMS2 Intelligent USB Dual-Slot Quick Battery Charger for Li-Ion/Ni-MH/Ni-Cd/IMR 16340 14500 18650 21700 20700 AA AAA and More Batteries, with LumenTac QC3.0 Charging Adapter

This charger will not only recharge any size rechargeable battery that will fit in it; but will also repair rechargeable batteries that previously would not accept a full charge. This saves money on having to buy new batteries when the old ones can work just fine.

I had it out of the box, glanced at the instructions but didn't study them or do much more than to plug it in using the Fast Charge adaptor. Simple. I've used other chargers before but nothing came close to the speed of this thing. From dead to fully charged with an 18650 battery only took a few hours ... if that ... instead of the usual 4+ hours. If you use one slot the Fast Charging is maxed out. If you use both slots it's not quite as fast as only charging one battery but still an order of magnitude greater than the other Nitecore chargers I've used. If you want a FAST and reliable charger you can't go wrong with this one.

Love this charger

I needed a battery charger for my 18650 batteries—not for vaping, but for an excellent, small LED Moxtoyu flashlight I bought and previously reviewed. The reviews on this charger were not the best, but they were better than the 4-slot version, and I did not see a need for the larger charger. The fact that you could charge my AA and AAA batteries were a plus. But, I knocked off a star because it is very complicated to operate if you were new to charging and wanted the higher charging capabilities, and it did a poor job of explaining them.

This Nitecore charger is the best I have found to charge 18650 batteries and others as well. Screen displays all the charging information. All charging is done automatically.

Screen goes out after 6 months. You can cut if off for few hours to bring the screen back and squeeze a few more months out of it until the screen completely fails. Overprice junk to me. Don't recommend at all!

I highly recommend it. Maybe the 4 is a better option. High quality.

Regular AA, AAA and 18650 3.7 volt charger. It does Li-Ion, Ni-MH and Ni-Cd batteries. I especially like the meg ohms (M ohms) display. As rechargeable batteries get weak the internal ohms goes up. Below 75 M ohms is plenty good anything over 300 M ohms and they are almost dead. The M followed by the Omega symbol means M (millions) of internal battery ohms of resistance. The other displays are self explanatory.