The making of the BLF UC4 charger: the start of a new venture, INTEREST LIST, UPDATE 3(Finalized UI and starting design)

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bmansc
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Sounds like everything you could ever want in a charger.

Count me in for one

Flying Luminosity
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Please can you add me to the interest list, thanks.

pepinfaxera
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Joshk wrote:
Oooo, how about an efficiency calculation mode for our batteries?

For example:
3000ma during discharge / 3500ma to re-charge = 85.7% efficiency.

No!, not to too complex, not to complicate, the simple to be the most useful.
Yes to measure impedance (internal resistance).
Yes measure capacity (in discharge).
Yes to storage load (3,7V ).
If load 3.6V (LiFePO4), 4.20 / 4.35V (Li-ion), 1.48V (Ni-MH / Ni-Cd and 2.0 Ni-Zn.
If manual / auto charge selection.
Long bays (slots) (if you can still change casing design), future 26,800?

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

d_t_a
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amishbill wrote:
BlueSwordM wrote:
Excellent.

BTW, what kind of information would you guys like to have?

Personally, I’d like for the information to be present at all times for each slot, which includes:

1. Temps per channel.
2. Internal resistance measurements, and updates.
3. Voltage.
4. Current.
5. Charging/discharging mode via acronyms.

Anything else?


Darnnit – I’d have sworn that I posted a reply.

Yes – a much detail as possible for each individual slot is a great thing.

The only item I can think of that I’d want is a Time in Mode for each slot. Knowing that your questionable cell has been taking in 300mA for 18 hours can be useful…

Just wondering if there should be a timer cut-off (eg. if battery has been charging for over xx hours, stop charging since it means the battery may not be taking in to long to charge, indicating a bad battery).. Although selecting a very low charge current to a very high capacity battery will also result in charging for very long hours… so I’m not sure how this would be done.

Joshk
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pepinfaxera wrote:
Joshk wrote:
Oooo, how about an efficiency calculation mode for our batteries?

For example:
3000ma during discharge / 3500ma to re-charge = 85.7% efficiency.

No!, not to too complex, not to complicate, the simple to be the most useful.

This would be a new “mode”. It wouldn’t complicate existing modes.
When this mode gets used, it would top off the battery, discharge it, recharge it, then display efficiency.

Agro
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Joshk wrote:
Oooo, how about an efficiency calculation mode for our batteries?

For example:
3000ma during discharge / 3500ma to re-charge = 85.7% efficiency.


I agree it would be nice. Smile
borealis
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Interested, please add me.

amishbill
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Joshk wrote:

This would be a new “mode”. It wouldn’t complicate existing modes.
When this mode gets used, it would top off the battery, discharge it, recharge it, then display efficiency.


I don’t think I’ve seen mention of this type of metric before.

I don’t think it would have much impact on wall-outlet based charging as the only different would be a little time. Charging from a limited supply like a solar cell though, I can see where you might want to know which cells will use the least source current to achieve a full charge.

I also don’t think this is an actual, distinct mode. What you’re asking for is just an additional calculation based on a standard Full Test. I see the biggest challenge being finding space on the display to show it.

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.

Joshk
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amishbill wrote:
Joshk wrote:

This would be a new “mode”. It wouldn’t complicate existing modes.
When this mode gets used, it would top off the battery, discharge it, recharge it, then display efficiency.


I don’t think I’ve seen mention of this type of metric before.

I don’t think it would have much impact on wall-outlet based charging as the only different would be a little time. Charging from a limited supply like a solar cell though, I can see where you might want to know which cells will use the least source current to achieve a full charge.

I also don’t think this is an actual, distinct mode. What you’re asking for is just an additional calculation based on a standard Full Test. I see the biggest challenge being finding space on the display to show it.

Yea I thought it up.
For the flashlight community, you are right, efficiency is just a matter of a little more time on the charger. But for the DIY Powerwall community, battery efficiency would be very interesting and could identify poor performers.

Joshk
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Battery efficiency may even identify batteries in the early stages of self-discharge issues. Cool

Muto
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Count me in

After the Apocalypse there will be only 2 things left alive, Cockroaches and Keith Richards
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Rockin’ In Bedrock, Twitch, Twitch!
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Big Sky Country

der_horst
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i’m interested

opbigdave
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in please

netgear68
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count me in for one.

patchythepirate
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This seems amazing, put me down for one

Petr Sixta
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I’m interested in this charger, count with me.

dnei519blf
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In for one. Thank you!!

mkor100
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Would be interesting. How about real internal resistance measurement? How about tolerance for finish charging/discharging voltage? Especially I prefer finish voltage less than 4.2V, better 4.19 minus .05V .

t-soung
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I’m interrested in 1.

BlueSwordM wrote:
Excellent.

BTW, what kind of information would you guys like to have?

Personally, I’d like for the information to be present at all times for each slot, which includes:

1. Temps per channel.

2. Internal resistance measurements, and updates.

3. Voltage.

4. Current.

5. Charging/discharging mode via acronyms.

Anything else?

I like the display of the XTAR VC4S. It shows all information for all channels at the same time.
I also want two USB outputs for loading i-phone etc.
This reduces further power supply units.

rost333
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Here are the additions since last week’s update and the BLF INTEREST LIST file linked to in post #1 have been updated too.
The interest list count now stands at 404 chargers.

POST # NAME
915 Tete
917 micknatt
918 Lipfit2000
919 mavortium
920 brenden23
921 ISO
922 iamnuts
923 4141003
924 scarnific
925 P33
926 Marc E
927 alex64
928 Kiltan
929 redsuns
931 LOTL
932 bmansc
933 Flying Luminosity
938 borealis
942 Muto
943 der_horst
944 opbigdave
945 netgear68
946 patchythepirate
947 Petr Sixta
948 dnei519blf
949 mkor100
950 t-soung

Dutcheee
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Looks very nice!

One qestion, maybe it came up already, but I only see low voltage recovery for li-ion.
It is one of the things I dislike on the opus, when trying to recharge fully depleted NIMH I always need to “jump start” them in order to get recognised.

Will this problem be solved on the BLF charger? That alone is a good reason for purchase!

9V battery support would be another bonus.

BlueSwordM
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@t-soung, sorry, but I won’t be including a second USB port on the design. Feature freeze has been done for a long time.

Upping the USB port current from 900mA to 1500mA would be an option however.

@Dutcheee, I do not think it is a good idea, but I’ll consider it a bit.
No 9V battery support, sorry. No more features to be added.

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

riffraff
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“No 9V battery support, sorry.”

Wait, what? How will I recharge my smoke-alarm batteries?!? And my AM/FM transistor radio batteries? Oh, the horror! Wink Wink Wink

264
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Please add me to the interest list.

Dutcheee
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@ BlueswordM What is the reason not to be able to recover NIMH? Quite a few of my AAA’s are down to 0 when I recharge them. Even eneloops that have been charged once. They seem to work 100% after the recharge.

Would be a very nice addition IMHO!

For the 9V’s in my sons RC car remote I can live with These

Big Smile
leftdisconnected
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Dutcheee wrote:
@ BlueswordM What is the reason not to be able to recover NIMH? Quite a few of my AAA’s are down to 0 when I recharge them. …

I’ve been using NiMH AA and AAA batteries for decades, but I’ve never discharged any to 0V, so that’s pretty impressive Wink . Perhaps…

1. Features on this charger are frozen, or at least gelled Wink .
2. Recovery is actually somewhat difficult as it’s the battery chemistry is not obvious when the voltage is out of the normal range. Triggering a recovery mode manually would be desirable, but adds complexity to the user interface (I would like this option, as it avoids auto-detection and requires special knowledge).

I’ve occasionally had to recover NiMH cells, but it’s usually as simple as shorting the positive and negative terminals with a cell inserted. That tends to jump-start the charging process on my old LaCrosse charger BC-700, anyway.

RobAllen

BlueSwordM
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Because that’s a good idea for NiCd cells, but not NiMH cells.

One way to remedy this would be to just let the cell in the charger until it accepts current, like how my Miboxer C4-12 does with old NiMH cells.

I would rather fix the devices that do this rather than counting on the charger to do so.

TLDR: Simpler can be better.

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

boostedsubie
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Put me in for 1

d_t_a
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leftdisconnected wrote:
Dutcheee wrote:
@ BlueswordM What is the reason not to be able to recover NIMH? Quite a few of my AAA’s are down to 0 when I recharge them. …

I’ve been using NiMH AA and AAA batteries for decades, but I’ve never discharged any to 0V, so that’s pretty impressive Wink . Perhaps…

1. Features on this charger are frozen, or at least gelled Wink .
2. Recovery is actually somewhat difficult as it’s the battery chemistry is not obvious when the voltage is out of the normal range. Triggering a recovery mode manually would be desirable, but adds complexity to the user interface (I would like this option, as it avoids auto-detection and requires special knowledge).

I’ve occasionally had to recover NiMH cells, but it’s usually as simple as shorting the positive and negative terminals with a cell inserted. That tends to jump-start the charging process on my old LaCrosse charger BC-700, anyway.

I recently found a very old NiMh (non-LSD type) battery in the drawer. It (very likely) has not been touched for at least 10 years. I recall using that battery when I had an old digicam (maybe around 2003 give or take a few years) that uses 4xAA batteries. So I use that type of non-LSD AA NiMh for that digicam. (Eneloops were not yet available when I used that digicam, although I recall the LSD “Harmolattice” NiMh started showing up a few years after that).

When I found that AA NiMh battery, it measured 0.0x voltage on my DMM (less than 0.1v), tried it on a few different chargers but they didn’t start charging the said NiMh.

So I tried doing a parallel connection from a good AA NiMh + side to + side of this 0-volt NiMh; – to – side to jump-start the “dead” NiMh battery, for several seconds. This was able to increase the voltage of the “dead” battery (I forgot what voltage, but I think it was now higher than 0.5v).

Placing it in my charger, I did a refresh test (charge/discharge at ~0.2 or 0.3A discharge current), and I got ~1100+ mAh discharged capacity (the AA NiMh was labeled GP 1800mAh NiMh). Tried using it in AA flashlights still work (Turbo mode is not that bright, indicating it has a bit higher resistance), but Low, Medium and some High modes will work. So far, it’s a month later, the battery still works. So apparently some dead AA non-LSD NiMh batteries can be recovered..

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Interested!

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