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

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BlueSwordM
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Cost…

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

Sidney Stratton
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Joshk wrote:
In HS and college science they teach that only the last digit is non-precise. So if I say I have 2.5 gal of gas, it’s understood it could be 2.48 or 2.54. But if you say you have 2.500 gallons of gas, then it’s a fact that it was measured to at least the hundredth of a gallon.

So when you say “I worked out the probability” and the answer is 2.718%… that is fascinating to me.

Perhaps he tallied all the options, say 32 of them, and gave ‘a not probable’ value of 1%; to a ‘probable’ value of 100%; thus creating 3200 total points of which he subjectively added up some 87. This gives a ratio of 87/3200 = 0.027188 or 2.718 % chance of fruition.

Not defending WalkIntoTheLight, just pointing out what he could have done…

WalkIntoTheLight
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Sidney Stratton wrote:
Joshk wrote:
In HS and college science they teach that only the last digit is non-precise. So if I say I have 2.5 gal of gas, it’s understood it could be 2.48 or 2.54. But if you say you have 2.500 gallons of gas, then it’s a fact that it was measured to at least the hundredth of a gallon.

So when you say “I worked out the probability” and the answer is 2.718%… that is fascinating to me.

Perhaps he tallied all the options, say 32 of them, and gave ‘a not probable’ value of 1%; to a ‘probable’ value of 100%; thus creating 3200 total points of which he subjectively added up some 87. This gives a ratio of 87/3200 = 0.027188 or 2.718 % chance of fruition.

Not defending WalkIntoTheLight, just pointing out what he could have done…

Guys, it was a joke. The number I picked is just e (Euler’s number), expressed as a percent. I thought pi would be too obvious.

amishbill
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I don’t think anyone has mentioned the Adeaska VC4 Plus.
( Review )

I haven’t seen much if any mention of this charger here. It looks like it already has multiple charge cutoff points, can do 4 26650 at a time, can charge relatively fast, and the base model doesn’t cost a small fortune. The only thing I can’t tell is how long a cell it can support. As a Sofirn Protected 21700 owner, I’m interested in that answer.

DIY LT1 battery wrap image. "PDF on Google Drive":https://drive.google.com/open?id=1IHIEOi1NXu868IYNCzIM7D2Ulpxchmww

Fresh Sanyo NCR18650GAs already wrapped "for sale HERE":http://budgetlightforum.com/node/69120 if you like.

BlueSwordM
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Unfortunately, it doesn’t have very low current voltage recovery, or adjustable charge voltage.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

Sidney Stratton
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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.

BlueSwordM
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@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.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

Sidney Stratton
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@amishbill; ZeroAir mentions 70 mm length. My SQ2 has 71.8 mm sliders. If this can be of any help.

Wrench
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No love for Xtar chargers?

ZoomieFan
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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.

Chargers: 1xBasen BD01 5/5, 1x Gyrfalcon All-88 4/5, LiitoKala: 3x100 3/5, 2x202 3/5, 1x402 3/5., MiBoxer C4-12 3/5.
Flashlights: DQG Tiny III 26650 5/5, DQG Tiny III 18650 5/5
FiTorch MR35 3/5, Haikelite SC26 HD 3/5, Lumintop Tool AA/AAA 4/5, Nitecore LA10, Skillhunt H04FRC 4/5, Sofirn C01 BLF 3200k/5600k 2/5, Zebralight H600Fc 3/5.
Powerbanks: Romoss 30000 4/5, xiomi 1000 4/5, Xtar PB2 4/5, Xtar PB2S 5/5

WalkIntoTheLight
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Wrench wrote:
No love for Xtar chargers?

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.

Rat_Racer
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WalkIntoTheLight wrote:
Wrench wrote:
No love for Xtar chargers?

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.

WalkIntoTheLight
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Rat_Racer wrote:
WalkIntoTheLight wrote:
Wrench wrote:
No love for Xtar chargers?

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.

Mocarny
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Give it aggressive look with black and orange colors

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TeeDubya
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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.

BlueSwordM
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1. No.

2. Yes.

3. Yes.

4. Yes.

5. Yes.

6. Yes.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

BlueSwordM
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1 day left before feature freeze.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

DavidEF
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Will it have BeCu battery contacts? Silver plated ones?

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BlueSwordM
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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.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

Mr.Scott
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BlueSwordM wrote:
1 day left before feature freeze.

This hot-rod needs some racing flames on the sides.

Hmmm, or do batteries and flames not go together?

mikewilzn
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Definitely interested. Will be watching development.

DBSAR
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I’m definitely interested in this project

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Wrench
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WalkIntoTheLight wrote:
Wrench wrote:
No love for Xtar chargers?

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.

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.

Barkuti
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Just dropped by…

TL;DRed most.

Lexel wrote:
BlueSwordM wrote:

10. Low voltage recovery
Below 2,5V, charge at 150mA.
Below 2,0V, charge at 100mA.
Below 1,0V, charge at 25mA.

remove that dangerous feature,

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?

BlueSwordM wrote:

10. Low voltage recovery
Below 2,5V, charge at 100mA.
Below 2,0V, charge at 500mA.
Below 1,0V, charge at 25mA.

BlueSwordM, please fix this mess in the opening post

Please avoid fully quoting lenghty posts, namely with nested quotes. Trim quotes down to the essential. Helps with neatness and legibility. Thanks.

The human mind, and its programming, is at the forefront of a particular battle of The Light vs evil dark forces. Nearly every human being on this beautiful planet “Earth” has some sort of negative mind programming in its mind. And you better take care of your mind programming, or someone else will in this wicked world.

Pete7874
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Yes, can we please have the first post updated with the final set of specs, as it stands today?

Thanks.

pieman7
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Great project idea. Interested!

Schoki
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Interested as well…

BlueSwordM
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@Barkuti, thanks.

500mA below 2,0V would be rather bad for safety, and longevity.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

BlueSwordM
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Final features that will probably be included:

1. Adjustable charging current (0,05-0,10A-…-3,0A) in 0,1A steps.

2. Support for multiple chemistries (NiMH, lithium-ion, lithium ion HV, LiFePO4).

3. Temperature monitoring (45C max below 2A, 60C max below 3A).

4. 4 cell channels, with support for AAA sized cells all the way to the largest 21700/26650/D cells up to 78mm length.

5. Active cooling if temperature exceeds 45C, and if all channels are active above 2,5A.

6. Full current cutoff according to charging current (10%).

7. 12V-20V input voltage compatibility.

8. Nickel coated phosphor bronze/brass rails for highest conductivity and accurate internal resistance measurement. Or just well plated nickel plated A3 steel if too expensive.

9. Internal resistance measurement.

10. Manual low voltage recovery for normal lithium-ion cells
Below 2,5V, maximum charge rate of 100mA.
Below 2,0V, maximum charge rate of 50mA.
Below 1,75V, it has to be manually activated.
Below 1,0V, maximum charge rate of at 25mA.

11. Adjustable max voltage for lithium ion charging: 3,65V-4,35V in 0,05V steps.

12. Storage charge mode: 3,6V. Lower would be better, but it is too low otherwise for most people.

13. Individual channel selection.

14. 4 button UI.

15. 100-200-350-500mA-1000mA discharging functionality.

16. Automatic charging current adjustment available.

Some extras that would be very nice, but not necessary if costs exceed 49\$US with the below feature set.
1. microSD card slot for graphs.
2. Bluetooth functionality.
3. Charging/discharging graphs to a USB drive.

Feature freeze will occur at 11:59PM EST.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

Pete7874
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Looks great.

Is there a price target for this? Or still too early to say?