MakerFocus 4pcs 186 50 Charging Board Dual USB 5V 2.4A Mobile Power Bank Module 186 50 Lithium Battery Charger Board with Overcharge Overdischarge Short Circuit Protection DIY USB Power Bank Board

I thought they weren't working right at first.Of course hook them up properly or you can burn them out...that wasn't the problem.They were charging the battery great from all three ports in testing. But it wouldn't charge a phone. It was saying "out" but it wouldn't work.The alligator clips weren't making enough contact through the teeth to move enough power.Once I soldered decent wire between the board and the battery, it worked perfectly.

My wife is the most laziest woman in this world who never wants to charge her phone in wall and keep asking me to plug it charge for her regardless i am busy or not... okay! Then i found this charger board to get my little project done for her. The most powerful power bank that could charger over 20 times of her phone and more than 10 times of her ipad. Thanks for the QC (quick charge circuit) + USB-C port that would charging the power bank quicker too.Note:Seller needs to correct the specs, maximum input: 3-4.2v. Typically that for lithium max voltage but it should be fine to use usb port 5V/2A input to charging the power bank which faster than microUSB 5v/1A. Depends on how many battery you have in parallel.

Great little unit. Only one I could easily find that has Lightning in. I’ve tried them with many different types of 3.7v batteries, from 1860s to flat Li ion packs, worked great. Took a star away because one of 4 was DOA, would strobe its display whenever a battery was attached. Other than that, awesome product!!

I used these boards while making some powerbanks with my students by connecting them to recycled lithium 18650 cells that were harvested from various battery power supplies. It is nice to have the ability to use both USB A ports at once and have the 2.4amp for larger power draws. Working on fitting them into different enclosures can be a little challenging with all of the smaller ports but the build quality is great so don't have to be too nimble. Overall I really like these boards and hope to use more of them!

I was going to make few power banks from 18650 I had laying around and came across these boards. They are pretty simple to use - just make sure that you connect it properly. Button works only to turn in on and off, nothing else. Charge current from a good power supply is around 1-1.5A. If you going to build big power bank with it (like 20000mAh) - it may take ~18-20 hours to fully charge it.Pros:- You can charge batteries with Mini USB, USB-C and Lightning cable.- Board detects charge / discharge.Cons:- What ever they say in specs about quick charge and 2.4A current is a total misinformation. Both USB outputs provide around 0.8-0.9A. Not even 1A.- Indication light is very bright and there no way to turn it off during charging (and I suspect it draws some extra juice from batteries as well).- It does not turn off by itself after charge is done (both ways when you charge it or charge with it). It turned off by itself only after I disconnected phone cable.If you ok with outlined issued it actually works. Just lower your expectations.Update:- Got it output 2A with the resistor load.Update 2:- It turns off display in a while after you start charging something with it; only "out" glows.- It displays 0% while batteries still are 3.65V which is quite weird. "Normal" healthy cut off voltage for most batteries is about 3.2V. It means that this board does not use about 40% of battery capacity OR indication is not correct.Update 3:- I just tried 2 more boards - first one got to 0% on 3.56V, but the second one displayed 13% left with the same battery. Very inconsistent.

Meets expectations and nice to have a more granular way of measuring remaining power left in the batteries such as actual percentage. Glad I found this on Amazon but sadly Amazon no longer has 18650/26650 power bank batteries for sale. You're going to have to pry these batteries out of an old device to give them new use or get your Lithium ion batteries elsewhere.If changed to a different battery system it takes a couple of times for the system to power up to update available capacity in new system, so it automatically calibrates.

Got this product in the other day, and it is exactly what I was wanting. It is nice to have the multitude of ports that this product comes with. In the pictures, they do have the positive and negative terminals labeled wrong. Go with what is labeled on the board, and you will be good. The ports are a little tight when you first use them, but after that they work just fine. This was my first time soldering, and working with 18650 cells, and getting the board and bringing it all together was awesome. I am very pleased with my purchase, and would differently buy again.

Works really well as a charging and usb circuit for things that are not super sensitive to voltage. It will only put out 4.68v @ 1.5amp and makes Raspberry Pi (3 or newer) throttle their processors making them basically worthless.