- 【Universal Battery Charger】: 18650 3.7 Volt Rechargeable Battery & Flat Top Battery Li-ion LiFePO4 IMR INR ICR 26650 25500 22650 18490 18500 18350 17670 16340 RCR123A 14500 10440 Batteries, Ni-MH Ni-Cd A AA AAA AAAA C SC Batteries
- 【High Speed Charging for 4 Cells Simultaneously】: AA AAA battery charger has a built-in intelligent identification chip that can identify battery model capacity information, match different charging currents and voltages for different types of batteries, and protect the battery while charging quickly, extending battery life.
- 【Professional Quality】: Keenstone 18650 battery charger comply with UL, CE, FCC, RoHS standards and related project certification, made of V0 class fire retardant materials.Built-in smart circuit protection system, effectively preventing battery overcharge, overcurrent, overvoltage, overheating and short circuit, protecting the safety of rechargeable batteries
- 【LCD Display 4 Bay Battery Charger】: LCD display to monitor the four slots information, and can independently display battery parameters such as voltage (V), current (mA), and time (h).Through smart LCD display, you can easily understand the charging process and battery health status, making your charging experience more smart
- 【What You Get】: Household battery charger, AC Adapter, Car Adapter, User Manual and 15 days unconditional refund, 24 hours enthusiastic service.
Keenstone Universal 18650 Battery Charger
Are you looking for a battery charger that can support multiple battery types at the same time? Here is your best choice! Keenstone 4 Slot Smart Battery Charger Made of high-quality materials, reactivate your battery, light up your life！
18650 Battery Charger Is Compatible with:
- Li-ion LiFePO4 IMR INR ICR 26650 25500 22650 18650 18490 18500 18350 17670 16340 RCR123A 14500 10440 Batteries
- Ni-MH Ni-Cd A AA AAA AAAA C SC Batteries.
Keenstone Household battery charger
|Input||AC 100-240V 50/60Hz 0.35A( MAX) or DC 12-24V 1A(MAX)|
|Output Voltage||4.2V / 3.65V / 1.5V|
|Output Current||500mA X 4 / 1000mA X 4|
|Weight||14.3 Ounces / 405.40 g|
|Size||7.24 x 6.3 x 1.57 inches|
If you looking for a charger for AAA batteries keep looking. Clearly this wasn’t designed for AAA batteries.The charging compartment individual battery slots are too wide for a AAA battery and the badly designed curved positive (+) charging post causes the battery tip not to stay centered and slip off. Have to monkey around to carefully position the battery. The slightest charger movement causes the battery to pop off the contact and not charge.The display is very, very dim virtually unreadable in normal room lighting. Have to look at the display on a 45 degree angle in a dark room to even see it. Display issues are noted in other reviews so it seems to be a design problem.Returning will look at buying another brand.
Listen, if this thing is in an office that is miles away from where you sleep, great it’s going to do it’s job and you will be happy with it. If it’s at home though, be aware that the LCD screen is just about the brightest blue light I have ever seen in my life and it’s been absolutely obliterating my sleep. It’s literally so bright it will glow from another room under and around a closed door. You can’t turn it off, and the color is right in that zone that sleep researchers say will ruin you.I’d give this 5 stars for the actual construction and operation, but I’m knocking 2 off cause the screen is insanely and pointlessly bright, and there’s nothing you can do about it. Make the light orange, make it much dimmer, or give the backlight a timeout after inserting/completing/removing a battery.
Scotty Pearson –
I primarily use this for my 18650 batteries that I use for vaping. My old charger was a 2-port Trustfire charger that was beginning to whine a bit while charging batteries and one of the light indicators were not functioning. So I did my research and ultimately decided on this Keenstone charger over a few others. I picked this one because you can use it to charge AA, and AAA batteries to name a few in a addition to safely charging my 18650’s. I wanted the ability to charge my batteries a bit faster since the Trustfire only did so at 500mah and this one does 500mah and 1A. I tried the 1A setting and it doesn’t seem to charge them (18650’s) all the way because my battery indicator on my vape shows 4/5 bars on the 1A setting. This isn’t the case with the default 500mah setting and they charge all the way if I choose that setting. This comes with a car charger, but I’ll unlikely ever need to use it, but it’s nice to have. Great for the price and the display is pleasing and shows voltage, charge levels, and time.
John Anderson –
I picked this up since I started to accumulated 18650 cells from salvaging electronic devices. I didn’t have an excellent way to charge the cells. Using a benchtop power supply isn’t the best way but works in a pinch. This charger has helped me utilize a lot more of these cells into my projects. Also, I’ve been able to recover quite a few cells that the onboard battery management system in some of the power and battery packs I salvaged didn’t want to charge. This device says it’s not for recovering cells but its worked so far without any issues for that purpose. In hindsight, I don’t think those cells were bad, just pulled so low that the BMS stopped it from being charged. It does have the ability to take several different battery formulations and sizes. So far, I’ve only used LI 18650s in it. Both with the button tops and flat tops.
Lives up North –
Very nice charger. Seems smart. Three dings. If the price point is good after reading these, I recommend this charger.First, if you need to charge more than 2 26650 batteries at a time this is the wrong one. Dont get it (see pic). It only holds 2 at a time and it’s odd that they don’t seat correctly in there as they’re a little to big for the indent they’re supposed to rest in.Second, the instructions say to take batteries off the charger after 24 hours or it’s bad for them. That’s a bummer. You’d like to have a bank of topped off batteries to grab and go, not be cycling them and labeling them, etc. trying to track which ones were topped off when. I’m not a battery junky. Maybe a commenter would say that this not an issue for Lion batteries, only NiMH.Third ding. The little spring loaded lever that grabs the battery is adequate, but just. Seem cheep. springs sharply back and seems like this could break.4 stars still? Yes, I think so. It’s an otherwise good charger and the info on charging rate, determining which battery is on it (it knows MH from Li as soon as you snap the battery in) is really nice. I charge 1 26650 for a flashlight and 2 18650s for a headlamp. It will hold all 3 batteries at once, so it will work for me. I’m keeping it.Hope this is helpful. Good luck!
Michael D. Fisher –
I bought this unit because one of the reviews said it even charged his ‘dead’ batteries. I had a BUNCH of ‘dead’ batteries my other NAME BRAND (Sony and EverReady) chargers said EVERY BATTERY I put in them was ‘dead’. I knew that couldn’t be true, so I went out and got this one, based on reviews.Now I have a bunch of fully charged ‘dead’ batteries lighting all the things up! two dozen ‘dead’ batteries I had, ONE was truly ‘dead’. I gotta tell ya, this thing ROCKS.I am also diggin’ the LCD readout on each battery. Time/Amps/Voltage are continuously scanned on each battery so you can see its condition.For the money, this thing is a STEAL!! I’m of to buy another!
person in ID –
Great little charger. It can do 4 batteries at once, with two different charge inputs (amount of power). It even has a 12v plug that allows me to take it camping to charge various batteries for flashlights, etc.My only gripe is it’s a bit tough to get AAA batteries in it properly…you just have to fiddle with them a little bit (I hold them as I retract the negative terminal, and then it pushes on the positive one correctly), but it’s not anything that is a show stopper – you just learn that is how you use it.Works on multiple brands. Also shows if your battery is no more (won’t accept any input power or voltage).
Official Reviews –
Put my slightly low surefire 18650 on here.It overcharged it to 4.6 volts before I caught it.There is No overcharge protectiin on this thing…. I put it in my light to bring voltage down to 4, and took a pic.Also, on my brand new button top Samgsung 18650s, it wouldnt show voltage graph. Only shows amps and voltage readout, no graph..
G. D. E. –
I set a return same day I received it. Didn’t work out of the box. 3 slots of 4 worked but inserting any battery in slot A caused the entire unit to shut down. Needless to say I paid for a 4 slot charger so getting only a 3 slot was a deal breaker. Not very good quality control at the factory.
Over the course of my life, I have had many rechargeable battery chargers. I started with NiCad. They were terrible batteries that developed a memory very quickly. With the implementation of NiMH and now Lithium Ion, the batteries have improved quite a lot. This charger allows great flexibility when charging. I can charge both AAA and AA batteries at the same time. It displays the level of charge once the battery is inserted and will stop charging when they are full. Excellent so far.