Universal Smart Battery Charger 4 Bay for Rechargeable Batteries NiMH NiCd AA AAA C Li-ion LiFePO4 IMR 18650 21700 20700 26650 14500 16340 18500 10440 18350 RCR123a LCD Display UL Listed

We bought this to charge 18650 batteries for our vapes. There are 4 individual battery chargers and they work independently of each other. This means you can have various battery sizes in each one and they'll all charge. I also like the cut off function that stops when the battery is fully charged. The charger is super easy to use, no set up, just plug it in and go. It does change the display to show the mAH, voltage, and charging percentage for the battery.Haven't had an issue with it yet and it's been extremely useful for us as we keep 4 batteries in it charging and just swap out throughout the day as we need them.One last callout is that buying something like this at a vape shop would cost you 50%+ more from what I've seen. Great deal, in my opinion.

I've had this for a few days and pushed a dozen or so NiMh batteries and an 18650 or two. It detects and adjusts its settings as it should and appears to do a good just so far of charging my batteries. As it charges, the display cycles through voltage, current, charge level and time. Unfortunately, the timer function counts UP, not down, so all you can tell is how long it's been charging and have to guesstimate the remaining time. It would be very nice if it could indicate an approximate time remaining until the battery is charged. Nice that the four bays are independent, so I don't have to add in pairs like my other chargers.For my AA fleet, it starts charging at a 500ma (-ish) rate, and you can hit the button for the corresponding bay to flip that to/from a 1A fast charge rate. For most of my use, I'll leave it at the 500ma rate to keep my batteries happier. Build quality seems to be good, case has bottom vents to assist in convective cooling. Comes with 12VDC cord as well as a relatively standard figure 8 US AC cable.

I Have Used This Charger For A Camping Trip, To Recharge Our 18650 Li-Ion Batteries (3400mAh). This Did Not Drain The Car Battery, And Appears To Auto-Adjust For The Correct Charging Amperage (Or Manually). Easy To Use, And Appears To Function Well.Displays The Charging Rate And Percentages In Easy To Read Layout, And Cycles Through Charging Rates, Current, And Voltage.Did Come With A 12V Adapter For Mobility, And Is A Necessity While Away From Standard Home Power Receptacles.I Did Not Notice Extremely Warm Temperatures From This Unit While In Operation.This Unit Does Have The Ability To Manually Change The Charging Rates, By Using The Buttons Located Near The Display Above Each Battery, To Increase Or Decrease Amperage. Please Be Certain To Verify The Charging Rate Of Your Batteries Before Charging Them, As Each One Should Have A Specified Rate Of Charge. Refer To Operations Manual For Further Guidance On Using This Feature.

After reviewing other good chargers on Amazon & elsewhere (so many choices!) I bought 3 of these in 2018 and I'm content with my purchase, they work great for me. And since a dead battery can often recharge within 30 mins, I don't think they're slow, they work fine. I'm not sure what a couple negative posts were talking about, because I also charge a BIG battery from a vape, so big it barely fits in the slot... I put in an outside slot & I see no reason it can't hold 4 of those big boys if you wanted.Although you're not supposed to, I've even put regular akaline batteries in it, mostly at first just to see if they're charged or not, since the flashing numbers tell what the battery voltage is & the bars show the charge.. but a couple times they showed half charge & I let them top off & only took maybe 10 mins. I did that again today & one of the Duracell alkalines showed 1.5v, but the other one only showed .87v even though both showed fully charged, so I tossed that one in the recycle bag. So this also makes for a handy battery volt meter & especially for under $30, I think its a great little charger and glad I got 3 of them. You know the saying... "One is none & two is one" ...just in case the 1st one goes caput some day, plus I decided adding a 3rd one to my preps would make great trading stock someday. ; )P.S. The only thing it doesn't include is a discharge option, but from what I hear, only certain users that constantly top off their batteries really need that option (to prevent memory, right?) and that's not how I use batteries, so no biggie for me.

I've charged AA and AAA enelope NIMH batteries as well as some 3.7v LION batteries, and it works fine.While there is a fast charge (1 amp) and slow charge (.5 amp) I settled on using the lower setting as the batteries seem to get quite warm on fast, and slow while taking longer is adequate and I'm sure to not damage the batteries. I particularly like being able to plug into a 12v car outlet or AC at home.Only thing I'd like to figure out is if there is a reasonable solar charging option to plug into the 12v side of this, I would think it would work, but maybe better to use with a battery and solar charging the battery.

product was as decribed, would buy again!