The making of the BLF UC4 charger: the start of a new venture, INTEREST LIST, UPDATE 7 (Well, ramping stopped :/ )

this could force me to spend more money! why do i read these things :person_facepalming:

And we want it by Christmas.

How about degrading test?, you put battery into it, it will charge/discharge for a number of times in setting, and logging data into micro sd card.

It’s a tedious task if done by hand

You should try ISDT UI. It’s really quite simple. Yet it allows to conveniently do advanced stuff.

Interesting project. Will pay attention on it

Awesome idea :beer:

All I would like to see in a charger would be:

  • 4 x 2A charging
  • Storage charge/discharge

Basically an upgraded Nitecore SC4 (my main charger now)

Some of those bells and whistles suggestions I could most def be without.
I fear it ending up like this

Like Bluetooth/WiFi connectivity, RGB lighting… Calm down X to the Z Xzibit, don’t pimp my charger.

BlueSwordM, you might want to think about moving this thread to the BLF Special Edition Products subforum.

I think it belongs there, and more people will pay attention to it if it's in that awesome subforum.

I would love to have a charger that I can set for max voltage of 4 volts

Yup, Nitecore SC4, and also add

  • Adjustable termination voltage

(3.6v to 4.35v in 0.05v increments, since that would cover storage voltage ranges, and other li-ion chems as well. It already handles 3.6v, 4.2v, and 4.35v, so should be an easy upgrade)

Done!

The complete list of features proposed sounds great, but I’m really concerned it would never get built, or never meet the price target. And, it might be a nightmare to coordinate, like the FW3A 2-year project, with people eventually dropping out of the development team.

I’d be in for this, no ’bells & whistles’; just a solid charger.

Nice work Blue…. :beer:

I am a little confused by this,

  1. Adjustable charging current (0,1A-3,0A) in 0,1A steps.

I am no expert but AAA sized cells need less than 1 amp for charging?

That is 0.1A - 3.0A in 0.1A steps

0.1A = 1/10A …… :wink:

That’s a tenth of an amp. In some countries written as 0.1 while in others as 0,1.
And that was already updated, the range is said to start at mere 50 mA to work better with 10180 cells.

That is awesome!

This sounds like a SkyRC MC3000, without the bluetooth and PC interface. Which is great, because I have no need for the buggy bluetooth stuff or awkward PC connectivity.

So, the obvious solution is to ask SkyRC to see if they will produce it for $39 (or $49 with the USB stuff, which I don’t need). Has BlueSword asked SkyRC, and if so, have they responded?

If they come back with nothing but laughter, maybe a Plan B is needed. Or, increase the price.

I can’t speak for anyone else, but for me, the difference boils down to two things — usage and availability.

Usage:

  • A flashlight is something I carry around constantly and use dozens of times per day. So I want it to be good because I spend a lot of time using it.
  • A charger is something I only spend a few seconds with once every few weeks. As long as it refills my batteries safely, I don’t really care about the details. I plug it in, put a cell inside, then go do something else. A few hours later I take the cell out and unplug the charger. If I’m curious, I might also glance at it once in a while to check progress, so a display is nice to have.

Availability:

  • I make flashlights because I wanted something and it didn’t exist. The desired features simply weren’t available.
  • With chargers, what I want is widely available and there’s a lot of room to grow if desired, without having to do anything custom.

I mean, with flashlights, first I tried not making it… but that didn’t work. So I fell back to Plan B. But with chargers, when I tried Plan A (not making it), the result was agreeable. So no need for Plan B; the market already met and exceeded my battery-charging needs.

I’ve been googling around for this and haven’t been able to find it. Link? It sounds very interesting.

@Parametrek, I will not link it yet. It’s been in translation from French to English for a while, and I’m debating whether I should release it or not.

It was more of a side-project when I was doing my main project at school(motor oil recovery methods with various solvents, distillation, electrolytic restoration, etc), so maybe I should release it one day.

One thing is for sure: I’m going to release it when I want it. :wink:

To quote myself when I wasn’t as good in science English:

My current hypothesis is that the the lithium concentration inside of the LiCo2 anode is higher than usual, and leads to a phenomenon called passivation layering, along with the lower purity of the cobalt compound, caused the problems we encountered in these cells. It’s still not certain, but I could come to a conclusion in a few weeks.

Basically, this usually happens in lithium primaries due to their very high concentration of elemental lithium, forming a passvation layer as the battery isn’t used. This isn’t really bad for them, as they aren’t rechargeable, meaning it isn’t a problem. In fact, it lowers their self discharge rate significantly.

I came to that statement, because I noticed that with my Sanyo cells from that time, their self discharge rate is very low, even for a lithium ion battery. Even my best new cells didn’t have that low of a self discharge rate. So, I did some more research, and apparently, that behaviour is quite bad for lithium ion batteries on the first cycles, as by clearing that passivation layer, the internal resistance is quite high in the beginning, resulting in much more heat than usual if a battery was stored for a while. With the lower purity of the cobalt used, it resulted in an actual lower thermal runaway threshold.

That, along with charging a possibly months old pack along using the computer in a high heat environment, lead to the thermal runaways, and the massive recall.

@WalkIntoTheLight and others, why are you worrying about this project not coming into fruition?

If we only want the basic features we want, it should be fairly easy to have a charger built with these demands in mind.

It’s the more advanced features like advanced discharged capabilities using MOSFETs, USB data connectivity, microSD card compatibility, deeper slots for very large cells, etc.