Unfortunately, it doesn’t have very low current voltage recovery, or adjustable charge voltage.
I had previously purchased the SQ2 from Adeaska. A 2 bay 1/2 & 1 amp multi-charger. After a while, and after purchasing an inline USB tester, I realised the unit was defective. There never was a constant current delivered and the mode selection was inverted with two cells; i.e. with two batteries selecting 1 amp delivered some 400 mA (peak). Had to select 0.5 Amp to get some 800 mA. From ZeroAir review, this model is better.
As the logistics were erroneous and the current would constantly vary, I opted for a MiBoxer C4-12. The Miboxer has an equally nice display and IR test (the SQ2 doesn’t have IR). The VC4 has independant buttons / status display for all bays and IR. Zeroair mentions the sliders are ’scratchy”; which I had greased.
@Blue: It does have Battery Activation - see the blued manual in review.
@Sidney, but we don’t know about the currents used, and they aren’t settable.
I’m not only making this charger for BLF, but also for SecondLifeStorage/DIYPowerWalls.
I’m soon going to do a feature freeze.
No love for Xtar chargers?
My input/wishes.
- The contacts should not be flat. Some flattops are slightly recessed in the wrapper.
- Ideal would be slider switch or a knob to set the amps. One for each cell. Not a central button that controls all cells. An advanced menu is fine but everyday charging should be KISS.
- “12V-20V input voltage compatibility” I assume it also supports 240v on top of that?
I really like the 12v option because I like to quick charge cells in my car.
What about 5v for USB charging?
I think trucks quite often have 24v? Even up to 48v? (boats)
I had a electic razor that accepted anything from 5vDC to 240AC. All integrated in its small stand.
I don’t think Xtar would be a good fit for his requirements. Xtar generally does fully-automatic chargers, with no ability to tweak any settings.
Take a gander at the VC2S specs.
It’s a nice charger, but it’s fully automatic. AFAIK, you can’t adjust the charging current. It just does 1A/2A charging based on what it decides to do based on internal resistance. In my experience, that means it always picks the max current for 18650 cells.
Give it aggressive look with black and orange colors 
At least 4 amp charge rate x 4. 5 amp would meet some charge rate capabilities which will just go up.
Discharge/storage charge.
Cycling.
Conditioning/recovery.
Data log for charge cycles/batteries.
Battery ID for saved custom settings.
1. No.
2. Yes.
3. Yes.
4. Yes.
5. Yes.
6. Yes.
1 day left before feature freeze.
Will it have BeCu battery contacts? Silver plated ones? 
That would be lovely, but I doubt we’d be able to get BeCu C17200, even just nickel plated, although that would easily make it future proof for higher current draws(4A+).
Nickel plated brass would be a huge upgrade over the entire market, but that’s still just a hope.
About the BeCu springs though, I’m currently in the process of trying to find a domestic manufacturer to make a 2P3S/2P4S/2P5S battery holder, as the mold isn’t too expensive, and prototyping with a local company would be much easier.
This hot-rod needs some racing flames on the sides.
Hmmm, or do batteries and flames not go together? :person_facepalming:
Definitely interested. Will be watching development.
I’m definitely interested in this project 
As of late that is true but two of the best chargers ever made (aka quality charging across all supported battery types) and still available were made by Xtar so they know how to do it. VP4 Plus and SV2 both have adjustable charge rates and will charge any supported battery type correctly. There has been only about a dozen chargers ever that could claim this and 7 of them were made by Xtar. For me it has to be a great charger first. The VP4 Plus is also an analyzing charger, not the best but decent. Other options are SkyRC MC3000 and that is it. Unless you want to sacrifice quality charging across all supported battery types or loose functionality. If your OK with that you can add a few Opus models, a few GyrFalcon models, a LiitoKala and a Miboxer. As for quality I’d say Xtar is for the most part more reliable than most if not all consumer grade charges. If people were willing to pay decent money Xtar could surely make a quality charger that meets your requirements. Would they be willing to do it? No clue. I’d like to see SkyRC do a no holds barred update to the MC3000 but the cost would be unacceptably high. The above is based on my personal experiences and https://lygte-info.dk/ Round cell charger testing and reviews.
Just dropped by…
TL;DRed most.
Danger exists only in the eye of the moronholder beholder. ;-)
Cannot agree. There's people who may want to recover over-discharged cells while perfectly knowing what they're doing.
Place, for example, a li-ion cell on a crappy SK68 for amusement or testing. Or a couple cells on some crappy flashlight with lame buck driver. If I notice a cell just got over-discharged and my charger doesn't allows me to recover it, what do you think am I going to do?
Let people have options. This supposedly is an advanced custom charger. If pleasing the @#$% crowd is a priority, the potentially problematic advanced functions could be left accessible only after activating a special mode in some options menu or by pressing some specific key sequence. A warning message could then appear asking for activation consent.
The charger is going to have a dot matrix LCD screen, doesn't it? :-D
BlueSwordM, please fix this mess in the opening post. 