The making of the BLF UC4 charger: the start of a new venture, INTEREST LIST, UPDATE 3 (PROJECT PUT ON HOLD FOR NOW)

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Quillz
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Interested for 1 please

Quillz

BlueSwordM
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1. This one could be easily implemented.

2. Technically, it’s already been implemented, but only between 3,4V-4,40V. It could be extended to 0-4,50V, but a physical switch connected should be the only way to access this more advanced, and dangerous, mode.

3. That would be great, but this feature will not be included for cost and ease of assembly. However, external leads could be provided, if the user wants to pay for it.

4. In the current design, an 80/92mm fan can be used. I’d prefer going to 92mm, as it would make it very easy to replace it. 120mm would be very large, and would lower static pressure.

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

Joshk
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BlueSwordM wrote:
1. This one could be easily implemented.

2. Technically, it’s already been implemented, but only between 3,4V-4,40V. It could be extended to 0-4,50V, but a physical switch connected should be the only way to access this more advanced, and dangerous, mode.

3. That would be great, but this feature will not be included for cost and ease of assembly. However, external leads could be provided, if the user wants to pay for it.

4. In the current design, an 80/92mm fan can be used. I’d prefer going to 92mm, as it would make it very easy to replace it. 120mm would be very large, and would lower static pressure.

2. I think the UI should feel more like a power supply. Set your max voltage, max amps, and termination type.

3. I bet he would be happy with solder-pads on the PCB.

BlueSwordM
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@JoshK

2. Yes of course regarding current(up to 3A) and termination type, but even theoritically, charging voltage will be limited to 4,8V, due to the individual buck converters used needed some room to work.

3. Excellent idea! I’ll actually forward the idea to DLYFull, so we could actually include a special solder pad for the 4th charging slot, and allow charging/discharging for other types of cells.
This is an exception I’m willing to make, probably the only one, but I doubt DLYFull would be keen on that, rather than making custom leads, as it would be 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

paetzi
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I would also like the ability to attach external leads. Best would be something like the Olight UC Magnetic USB Charger

You could sell it as an add on.

Joshk
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@paetzi, yes, that’s what the pads will be waiting for. Someone will write a how-to, and you will just need to drill a small hole in the case and connect your wires to the solder pads.

thefreeman
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1) great.

2) hidden switch for advanced voltages sounds good.

3)

Quote:
That would be great, but this feature will not be included for cost and ease of assembly.

Understandable. About solder pads : ultimately wires can just be soldered where the contacts are soldered in the charger, dedicated solder pads don’t really add anything.

4) 92mm fan sounds great.

Something else, about the UI :

5) Could there be a way to configure several slot at once like on some chargers, for example the zanflare C4 : before 9s have passed since 1st cell inserted, the first button press enable configuration for all cells inserted. (not saying it should be this way, and in this case 9s is actually a bit to short to insert 4 cells)

Joshk
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thefreeman wrote:
About solder pads : ultimately wires can just be soldered where the contacts are soldered in the charger, dedicated solder pads don’t really add anything.

The solder connection to the battery contactor is dual purpose, it is both an electrical and mechanical connection. If someone were to try soldering a wire to the board at that point, the contact would fall over when the solder became liquid. Maybe that’s no big deal for someone with solder skills and a quality iron, but that’s not everyone.

osb40000
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Interested in two of these.

Barkuti
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Dedicated solder pads to anode and cathode battery rail connectors add some value and they are really very easy to set or put, all it takes is a couple spots where the solder mask is removed or unlaid, and maybe positive and negative (+, −) signs. The impact on the charger's cost is absolutely negligible, virtually nothing.

I see the default charging currents' list was modified, plus an additional 2.5 A value  was added. Since my list was written with decimals using point/period as separator (learned back in the days of writing computer programs), but the 2.5 A value was added with comma, it looks weird/wrong. I will refrain from judging the new value addition and how it fits in between, but in any case here is the list (whole point 1) fixed with commas (as BlueSwordM did at first):

 

1. Adjustable charging current: (0,03A – 0,05A – 0,08A – 0,12A – 0,18A – 0,25A – 0,35A – 0,50A – 0,70A – 1,00A – 1,40A – 2,00A – 2,50A – 3,00A).

 

The Light Innocent I am

awoody001
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Interested in 2 please

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I’m Interested for two items

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I’m interested in one piece. Need a charger that stops at storage voltage.

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In for one

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One for me please.

sueli428
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Joshk wrote:
So after Rayoui’s informative post, and some more research, I will be charging my cells like this from now on:

0.2 (for recovering an 18650 below 2.5v)
0.7 (for AAA NiMh/NiCd batteries, 14500 li-ion, or recovering a “heater” 18650)
1.0 (for gentle charging 18650, or capacity testing any li-ion)
2.0 (for quality 18650, AA NiMh/NiCd batteries, 21700, or 26650)

Hopefully this is useful to others.

I had read:

.5 was best for gentle charging quality 18650
1.0 was for 18650 that you don’t care about as much.

The specs on my protected EVVA 3500 rechargeable 18650 says standard charge rate is 1000mA which is 1.0 amps.

I am not sure if that means the recommended charge rate, or maximum rate. Or what rate is better for a new cell. Couldn’t find anywhere if they are ready to use right out of the charger either.

Joshk
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Any charge rate that doesn’t heat the cell is a gentle charge for li-ion. I haven’t noticed any heating of my Samsung 30Q charging at 1 amp. Do you notice any heating of your EVVA at 1 amp? That’s like 0.28C, so that sounds gentle to me. Do you have a link to what you read?

rost333
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Hi, below are additions since last update and the BLF INTEREST LIST file linked to in post #1 have been updated too.
The interest list count now stands at 547 chargers.

POST# NAME

1160 zaibas
1161 Funtastic
1162 Pistonsandgears
1163 Jtm94
1164 gds95
1165 daniu
1166 Batiste
1168 confucius
1169 vicastur
1170 Smoothynobutt
1172 luisgcan
1173 j8048188
1182 atobe
1188 TUNE4IT
1189 w4lls
1190 cheesecheeks
1191 NorthernHarrier
1193 CheapThrills
1194 hron61
1201 mgracia85
1208 Bribo
1219 BadWolf
1222 soppa1
1223 Giulius80
1226, 1243 Day_Light
1227 sac02
1231 thefreeman
1232 Quillz
1242 awoody001
1244 Skylight
1245 zeremefico
1246 jojosupir

If anyone is not on the list please notify me. Thanks!

Bluehinder
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I’m in for two.

wishiwereaskibum
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PM sent stating interested in one. thanks

WishIwereaSkibum

ashwally
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Interested in one Big Smile

Airtrade
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I’m in for 1.

4492011
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In for 2

beggindog
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t ouellette

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rost333 wrote:
Hi, below are additions since last update and the BLF INTEREST LIST file linked to in post #1 have been updated too.
The interest list count now stands at 547 chargers.

POST# NAME

1223 ………
1226, 1243 ……….
1227 sac02
1231 …………
1232 …………
1242 awoody001
1244 ………………

If anyone is not on the list please notify me. Thanks!


Hello rost333 , you’re doing a great job, Thank you.
I suggest you check out two posts, I think they asked for two and on the interest list they’re only listed for one.
Post #1227: sac02 , Please add me to the list for two units, please.
Post #1242: awoody001 , Interested in 2 please .

Greetings

Sorry for my bad English
(google translator) , (https://www.deepl.com/translator)

ElginAgain
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Please add me to the list for one.

wishiwereaskibum
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ISDT C4 user interface …

Hi,

I realize this is just way too late, perhaps, and I think this UI was mentioned once in this thread, but what is everyone’s thought on having the ISDT C4 UI? To me, it’s about nirvana. Sure it may / will add to the cost, but combine the near-perfect hardware specs and this so easy to use and functional UI, I think it’s a total game changer.

Ideas ppl?

WishIwereaSkibum

WalkIntoTheLight
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wishiwereaskibum wrote:
ISDT C4 user interface …

Hi,

I realize this is just way too late, perhaps, and I think this UI was mentioned once in this thread, but what is everyone’s thought on having the ISDT C4 UI? To me, it’s about nirvana. Sure it may / will add to the cost, but combine the near-perfect hardware specs and this so easy to use and functional UI, I think it’s a total game changer.

Ideas ppl?

I think the more complicated you make this charger, the less chance it’s ever going to be produced.

BlueSwordM
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Well, that is a possibility, since DLYFULL actually makes ISDT chargers. Smile

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

Aaron93
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Interested in one.

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