5pcs Lithium Battery Charger Module Board 5A DC naar DC CC CV LED Driver Step Down Buck Converter Board Constant Current Voltage XL4015

I tried to use this as a NiCd battery charger. It worked great for a while, but then I tried draining the 4-cell battery down to 1.1V per cell. After that, it consistently exceeded the 1.5A set point I had set with the current limit control. I traced the problem to the fact that I had connected the -Input terminal, to the -Output terminal -- a real BOZO NONO it turns out!Why did I do that?!? Because, the charging power also powers the MCU that runs the charging process. Because these are NiCd batteries, you can't just set a terminating voltage, and walk away! So, I designed a Negative Delta Voltage termination detection algorithm. That worked great. I even added temperature sensing! But, since I was also using the same MCU to monitor the output voltage, so it could shut the device down before the batteries are drained too low, I needed a ground reference on the input AND the output. Or, so I thought. Now that I know this thing doesn't like that, I'm devising a way to power the MCU, monitor the output voltage, and NOT violate the grounding restriction!So, I'm redesigning it to isolate the input power, from the output, charging current.UPDATE: My modifications did the trick! It now works quite well. I set the voltage to 8V [a little beyond the highest expected battery voltage during a Fast Charge], and the current to the desired charge rate [1.5A, in this case]. It gets only a little warm, and maintains a constant current throughout the charge. A remarkable little device, at a remarkable price!

I use this for a project on a small TV and tune the volt and amp required. Really happy with this board, for the price amazing.

This device works fine at 9 v. I was able to set up some LEDs in series without resistors no problem. When I switched the power supply to 5 v, the mA on the output increased x5 and the CC pot no longer seemed to make a difference. That was a bit surprising and risked my LEDs. Same at 6v. At 7-8 v the current draw from the input was unstable but the output adjusted ok. Everything smoothed out at 9+v and worked fine up to 15 v.Took a bit of adjusting to get voltage and current pots in the range where they are effective. Might want to use resistors and not LEDs to tweak it at first and keep from blowing out your diodes.For reference, I have the output terminals on the left, the input on the right and the pots are at the bottom of the board. Turning left pot CCW turns down current, turning right pot CCW turns down voltage. Not terribly efficient in this range, about 60%.

Used these as CC LED/laser drivers, work great. All of them seem to work the same. 1 star knocked off only because of no documentation received or in description (at least when I bought it)

As the titcle says, these are terrible. DO NOT BUY, STAY FAR AWAY. These simply do not work. I can twist the POTS until my fingers hurt but the output voltage NEVER changes from the same as the inpot. Cheap GARBAGE.

Work very good as a charger for Li batteries. It also can be used to charge any battery including car storage batteries. Just need some external cooling if it is used with load currents above 3A.

I've had some quality issues with these. On all the units, turning the potentiometers for voltage do not change teh output voltage at all. So basically they come set at around 12v and that's what comes through the "out" no matter how much I turn the pots. On one unit the green LED to turn on but never switched teh blue LED on when the battery was full charged. I bought these for an electronics class I am teaching and a little disappointed.UPDATE: I found that if you turn the voltage potentiometer 30-50 revolutions, it will then react. About half of them needed this much turning before voltage changed.

Great value in a constant current module no instructions on the controls or led's on the board. After a little tinkering I figured it out. The price was great and it works well.