LiitoKalaLii-M4S 18650 Battery Charger Smart Universal Charger LCD Display for 26700 18650 26650 21700 AA Touch Button LCD Display Test The Battery Capacity

Not sure why it's still so hard to make a decent battery charger/analyzer in 2025, but here we are. Most chargers don't seem any better than they were 10 years ago. This one is the best one that I've found.Pros:- displays all the important quantitative info on one screen: battery type, charge voltage, capacity, time, etc.- has excellent analysis mode which will let you find worn/bad cells quickly- records both discharge capacity and charge capacity- will charge/analyze from each of the 4 channels individually- the soft keys work better than the mechanical switches on my other chargers- will charge NiMH and LiIon- has storage mode from LiIonCon:- I just wish the screen would stay on without the 30s timeout. But press a soft-key and it turns on again.- 21700 doesn't appear to be supported, probably because they're just a tad too long. There's one review saying they will work without the button top, but I've no direct experience and they're not listed as a supported cell.The above features should be standard with all chargers, but all the others seem to have shortcomings: no test mode, can't test in all channels, can't handle NiMH and LiIon, etc. This one does it right.Other reviewers tested to show the accuracy of the analysis. I didn't double check. The readings are consistent with my analysis on another unrelated charger so I think this is trustworthy.Update: It seems to work fine with 21700 batteries!

Fantastic!! Four fast independent channels for discharge (i.e. true!) capacity testing @500mA (some other tester/analyzers only discharge at 250mA which is slower and also a less strenuous test), charging, etc. Faster than the other analyzer/capacity-testers I have, and those others ONLY work for Ni-Mh batteries while this one is for Li-Ion batteries as well! And a GREAT value at around just $23 USD!! You can see the Discharge Capacity (i.e. true capacity) reading when it finishes the discharge portion of the Test mode cycle, even while it's still in the final charging portion of the cycle and has not completed it. You should ignore the useless "charge capacity" which is always higher.Only problem I've had is that *sometimes* after fully finishing Test mode it has strangely switched to Charge mode and "forgot" the discharge capacity information, which is very annoying unless you noted the discharge capacity earlier before it switched; it is *possible* that this was caused by a glitch/interruption occurring in my house's A/C power, but I'm not sure.Also an annoyance is that despite having a USB-C input port for power, it does NOT work with a modern USB-C wall charger (using USB-C to USB-C cable). You must use a USB (Type A, rectangular) to USB-C cable like the one provided with the product.

This does almost everything I need it to do for the 18650 cells I harvest from modem backup packs, with a couple of exceptions.The main shortcoming is that it won't charge dead/flat/low-voltage cells. For that, I had to buy a separate model, a MiBOXER C8, which does the job perfectly. That's unlikely to be an issue for you if you always use your cells within a healthy range, but if you've got one that's been pulled down below a couple volts due to parasitic draw or self-discharge, you're out of luck.The other "issue" is not necessarily a flaw, but it's missing a specific feature that would really help me out and seems like kind of a no-brainer. When you run a cell through TEST mode, it first completely charges it, then completely discharges it, then completely charges it again. That's a great plan if you will use your cells soon, but I test a whole lot of cells and don't always put them into service right away. I would much prefer the final charge to hit the STORAGE mode's target voltage of ~3.75v, not a full charge to 4.2v. I can work around that by checking the charger occasionally until it's finished fully discharging, writing down the capacity result, then switching to STORAGE mode for the final charge, but that manual intervention is a pain when you go through thousands of cells per month, day after day. If I'm testing a batch while I sleep, I'll usually wake up to fully-charged cells and then have to discharge them partially again via STORAGE mode.Lastly, my copy had a corner of the LCD screen that wasn't fully adhered and kept popping up every time I interacted with the screen. I fixed it with some superglue in a few seconds, but it looks a little grimy now, and depletes my confience in the build quality.One thing I will say is unexpectedly nice is that there are no mechanical buttons on the unit - just touch sensors. Less to go wrong, hopefully, especially when this sees heavy use. I had an older unit with mechanical buttons that wore down after several months of constant use.

Really awesome battery charger/tester. It has charge, discharge, storage and test functionality. The menu and information is really easy to understand. The display has an auto-off feature or the ability to stay on all the time. Really easy to use. Keep in mind that you can only get 1A charging if you're charging two batteries. If you charge 3 or 4 you will be limited to 500mA. Still, it's a really great product if like me you often salvage 18650 cells from other battery packs.

Un excelente producto. Más de lo que esperaba.

Handles my 18650 batteries well. Four independent channels.The capacity tester is valuable to check the health of the cells.