Got a new charger-Miboxer C4-12, 4 slot X 3A/slot, total 12A output

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pennzy
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I don’t know exactly what the right IR is but all my new cells were high in the Miboxer. They do need to tweak something .

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FlashTom wrote:
ZoomieFan wrote:
I check shortly after inserting. Certainly not 10-15 minutes. Then I’m gone again, draining another cell Smile

Best would be to keep an eye on the internal resistance indicated in the charger. Make sure it is as low as possible by cleaning all contact areas before and by turning, re-inserting or dangling the battery in the charging slot until you get a reasonable number on the display. Once you have values of 200-999mOhms you don’t have to expect this charger to auto set the current to 3A. My C4-12 had real problems with button top cells and I got values between 320 to 999mOhms, i.e. a pre-selected charge rate of 0.00-0.15A.

All I ever did is pushing/twisting cells until I saw the lighting symbol in the display.
So the reason it charges slowly could be twofold:
- Bad contact.
- It’s just working but I just have to wait a few more minutes until the intelligence of the charger ramps up the amps.

What’s a reasonable Ohm range?

Chargers: 1xBasen BD01 5/5,1xDodge Charger, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5
Flashlights: BLF Q8 4/5, Convoy BD04 5/5, DQG Tiny III, FiTorch MR35 3/5, Haikelite SC26 HD, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5
Waiting for: 21700 EDCs to hit the market.

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JasonWW wrote:
ZoomieFan wrote:
JasonWW wrote:
ZoomieFan wrote:

Can the user upgrade the firmware.
I really would like an upgrade that keeps the settings at 3A permanently. All cells I charge in it are 3500+ mAh.
Now I have to play with the settings every time I put in a cell.

No, we can’t alter it.

Why do you have to manually set it every time? Usually my Liitokala 26650 cells auto set to 2.90A or 3A anyway. Setting them manually is not that big a deal and is normal for all chargers.

It would not be considered safe to program it to automatically choose the 3A setting for every battery. No battery charger uses 3A as the default setting.

I bought this charger especially for 26650 cells, so they don’t take long to charge.
It was the 3A rating I bought this charger for, but when I put in a 26650 cell and check the amps it usually is charging with 0.7-1.5 amps.

Which Liitokala charger auto sets to 3A?


None, that would be too dangerous.

I have Liitokala chargers that I can set to 0.5A, 1A and 2A.
At least the indicator light stays permanently on those values. Obviously that’s no proof the charger actually uses those currents. I never use such cells but 2A would cook 900mAh cells.

Anyway my question was a bit unclear I think.
Which Liitokala charger has 3A output? I haven’t found one above 2A. And that’s for all cells combined. So only if there is one cell in the charger it gets 2A.

Chargers: 1xBasen BD01 5/5,1xDodge Charger, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5
Flashlights: BLF Q8 4/5, Convoy BD04 5/5, DQG Tiny III, FiTorch MR35 3/5, Haikelite SC26 HD, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5
Waiting for: 21700 EDCs to hit the market.

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ZoomieFan wrote:
JasonWW wrote:
ZoomieFan wrote:
JasonWW wrote:
ZoomieFan wrote:

Can the user upgrade the firmware.
I really would like an upgrade that keeps the settings at 3A permanently. All cells I charge in it are 3500+ mAh.
Now I have to play with the settings every time I put in a cell.

No, we can’t alter it.

Why do you have to manually set it every time? Usually my Liitokala 26650 cells auto set to 2.90A or 3A anyway. Setting them manually is not that big a deal and is normal for all chargers.

It would not be considered safe to program it to automatically choose the 3A setting for every battery. No battery charger uses 3A as the default setting.

I bought this charger especially for 26650 cells, so they don’t take long to charge.
It was the 3A rating I bought this charger for, but when I put in a 26650 cell and check the amps it usually is charging with 0.7-1.5 amps.

Which Liitokala charger auto sets to 3A?


None, that would be too dangerous.

I have Liitokala chargers that I can set to 0.5A, 1A and 2A.
At least the indicator light stays permanently on those values. Obviously that’s no proof the charger actually uses those currents. I never use such cells but 2A would cook 900mAh cells.

Anyway my question was a bit unclear I think.
Which Liitokala charger has 3A output? I haven’t found one above 2A. And that’s for all cells combined. So only if there is one cell in the charger it gets 2A.

The only Liitokala charger I know that charges 2A is the Lii-402 only when used with single battery on the slot #4 and using a USB charger that can provide 2A.
I’m not sure of any others Liitokala charger that can charge at 2A.. maybe someone can comment?

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The charger has a 12v 5A input.
I’m looking for a cable so I can plug it in my car.
Any advise where to buy such a cable?

Chargers: 1xBasen BD01 5/5,1xDodge Charger, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5
Flashlights: BLF Q8 4/5, Convoy BD04 5/5, DQG Tiny III, FiTorch MR35 3/5, Haikelite SC26 HD, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5
Waiting for: 21700 EDCs to hit the market.

JasonWW
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ZoomieFan wrote:

I have Liitokala chargers that I can set to 0.5A, 1A and 2A.
At least the indicator light stays permanently on those values. Obviously that’s no proof the charger actually uses those currents. I never use such cells but 2A would cook 900mAh cells.

Anyway my question was a bit unclear I think.
Which Liitokala charger has 3A output? I haven’t found one above 2A. And that’s for all cells combined. So only if there is one cell in the charger it gets 2A.


I’m pretty sure none of the Liitokala chargers can do 3A. Why are you thinking they made a high amp charger?

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70, Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

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JasonWW
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ZoomieFan wrote:
FlashTom wrote:
ZoomieFan wrote:
I check shortly after inserting. Certainly not 10-15 minutes. Then I’m gone again, draining another cell Smile

Best would be to keep an eye on the internal resistance indicated in the charger. Make sure it is as low as possible by cleaning all contact areas before and by turning, re-inserting or dangling the battery in the charging slot until you get a reasonable number on the display. Once you have values of 200-999mOhms you don’t have to expect this charger to auto set the current to 3A. My C4-12 had real problems with button top cells and I got values between 320 to 999mOhms, i.e. a pre-selected charge rate of 0.00-0.15A.

All I ever did is pushing/twisting cells until I saw the lighting symbol in the display.
So the reason it charges slowly could be twofold:
- Bad contact.
- It’s just working but I just have to wait a few more minutes until the intelligence of the charger ramps up the amps.

What’s a reasonable Ohm range?


For an unprotected 26650 high drain battery, under 50 milliohms is good.

My cyan and black Liitokala 26650 typically read 30 to 40 milliohms.

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70, Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

9 NarsilM user videos for BLF Q8, GT, GT Mini and ROT66

Texas_Ace BLF Calibrated Lumen tube

Maukka Calibration Lights for DIY Lumen Measuring Devices

ZoomieFan
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JasonWW wrote:
ZoomieFan wrote:

I have Liitokala chargers that I can set to 0.5A, 1A and 2A.
At least the indicator light stays permanently on those values. Obviously that’s no proof the charger actually uses those currents. I never use such cells but 2A would cook 900mAh cells.

Anyway my question was a bit unclear I think.
Which Liitokala charger has 3A output? I haven’t found one above 2A. And that’s for all cells combined. So only if there is one cell in the charger it gets 2A.


I’m pretty sure none of the Liitokala chargers can do 3A. Why are you thinking they made a high amp charger?

Because I’ve misread your message…. Sad

Quote:
Usually my Liitokala 26650 cells auto set to 2.90A or 3A anyway.

It’s about Liitokala cells being charged at 3A, instead of a Liitokala charger charging cells at 3A…

Chargers: 1xBasen BD01 5/5,1xDodge Charger, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5
Flashlights: BLF Q8 4/5, Convoy BD04 5/5, DQG Tiny III, FiTorch MR35 3/5, Haikelite SC26 HD, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5
Waiting for: 21700 EDCs to hit the market.

JasonWW
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Okay, now I understand.

This C4-12 is the first charger I’ve seen with this much power, 12A. Maybe it will start a trend where other charger manufacturers will release high powered versions of their current models. Then we will have choices. Thumbs Up

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70, Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

9 NarsilM user videos for BLF Q8, GT, GT Mini and ROT66

Texas_Ace BLF Calibrated Lumen tube

Maukka Calibration Lights for DIY Lumen Measuring Devices

XXX-Man
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Today my C4-12 decided to die…

I plugged it in and put two AAA cells to charge and it just went off.
Power supply is good.

Any suggestion what to look for on board?

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Crying . Sad … If you can’t revive it, may it RIP. Thumbs Up

Good luck fixing it. Smile

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I hope I will be able to do it.

It only charged batteries 20-30 times before it died…so almost new.

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/\ …. Thumbs Up

      You never know how a horse will pull until you hook him up to a heavy load. / Paul "Bear" Bryant ~/~\~ "Slow is Smooth, Smooth is Fast"

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         Rudeness Level /\ mΩ /\ {width:70%} /\ LightWiki /\ LED Tint Chart /\ LED Tint Picture /\ Xlamp size chart /\ BatteryU                   Flashaholic? Need Professional Help???   wink   /\ TheOriginal /\ TAB /\ LightSearch /\ BatterySearch /\ 14500's /\ DiCal                                                       

XXX-Man
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I just opened it up and I can say I’m lost…I don’t know what to look for.

Looks like it will rest in peace (or pieces).

It died after little use so I’m not sure about buying another, but I need charger like that.

"With the first link, the chain is forged. The first speech censured...the first thought forbidden...the first freedom denied – chains us all, irrevocably."

My reviews:

Sofirn SF36 /// Thorfire VG10S /// Sofirn C8F

JasonWW
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XXX-Man wrote:
I just opened it up and I can say I’m lost…I don’t know what to look for.

Looks like it will rest in peace (or pieces).

It died after little use so I’m not sure about buying another, but I need charger like that.


Since you opened it up, I guess you heard back from Miboxer and they said it’s out of warranty?

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70, Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

9 NarsilM user videos for BLF Q8, GT, GT Mini and ROT66

Texas_Ace BLF Calibrated Lumen tube

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XXX-Man
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I bought it over aliexpress, and I think I can’t get warranty.

Or if I can get it but I have to return charger that cost me more than buying new one.

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JasonWW wrote:
Okay, now I understand.

This C4-12 is the first charger I’ve seen with this much power, 12A. Maybe it will start a trend where other charger manufacturers will release high powered versions of their current models. Then we will have choices. Thumbs Up

Thumbs UpThumbs UpThumbs Up for choices. Always.

If I had choice I would go for something far more simple. No displays with settings. Just one button to set the current and that’s it. Just like the little LiitoKala and Basen chargers.

That brings me to another point. I’ve also bought a simple USB tester that shows me the current draw when charging. I learned something I knew for a long time but never got trough my thick skull.
A 2A (Basen) charger isn’t twice as fast as an 1A (LiitoKala) charger.
Sure 2A goes full throttle when the cell is (nearly) empty, but the more full it gets the lower the current.

I’m not saying that’s bad, or shouldn’t be that way, just that those high currents only matter in the beginning of the charging process. And when the cell isn’t completely empty, you won’t see high currents at all.
I have no way of doing an honest test but as a way to explain using fictive numbers I expect something like this.

3A: 15 minutes at 3A, 15 minutes at 2A, 1 hour at 1A and below. (90 mins)
2A: 45 minutes at 2A, 1 hour at 1A and below. (105 mins)
1A: 2:15 hour at 1A and below. (135 mins)

So 3A isn’t 3x faster than 1A.

Chargers: 1xBasen BD01 5/5,1xDodge Charger, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5
Flashlights: BLF Q8 4/5, Convoy BD04 5/5, DQG Tiny III, FiTorch MR35 3/5, Haikelite SC26 HD, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5
Waiting for: 21700 EDCs to hit the market.

JasonWW
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ZoomieFan wrote:
JasonWW wrote:
Okay, now I understand.

This C4-12 is the first charger I’ve seen with this much power, 12A. Maybe it will start a trend where other charger manufacturers will release high powered versions of their current models. Then we will have choices. Thumbs Up

Thumbs UpThumbs UpThumbs Up for choices. Always.

If I had choice I would go for something far more simple. No displays with settings. Just one button to set the current and that’s it. Just like the little LiitoKala and Basen chargers.

That brings me to another point. I’ve also bought a simple USB tester that shows me the current draw when charging. I learned something I knew for a long time but never got trough my thick skull.
A 2A (Basen) charger isn’t twice as fast as an 1A (LiitoKala) charger.
Sure 2A goes full throttle when the cell is (nearly) empty, but the more full it gets the lower the current.

I’m not saying that’s bad, or shouldn’t be that way, just that those high currents only matter in the beginning of the charging process. And when the cell isn’t completely empty, you won’t see high currents at all.
I have no way of doing an honest test but as a way to explain using fictive numbers I expect something like this.

3A: 15 minutes at 3A, 15 minutes at 2A, 1 hour at 1A and below. (90 mins)
2A: 45 minutes at 2A, 1 hour at 1A and below. (105 mins)
1A: 2:15 hour at 1A and below. (135 mins)

So 3A isn’t 3x faster than 1A.


Your numbers are way off. Most Liion chargers use 2 main phases. The CC phase which is constant current and the CV phase which is the contact voltage.

The vast majority of time spent charging a battery (let’s say from 3.0 volt) is spent in the CC phase. Maybe 75% of the time.

Once the battery is charged up to around 4.1v or so the charger will shift to the CV phase. The voltage holds at 4.2 and the current starts to ramp down slowly.

The CV phase is always very slow for the amount of power it puts into the battery. This is why you see cell phones say they charge from dead to 80% in one hour. That is the CC phase. It might take another 30 to 40 minutes to get that last 20%.

Lithium tool battery packs usually only charge them up to 4v. This makes them charge faster and the battery life longer.

Same for electronic cars. Tesla only charges their battery packs to roughly 4.0 volt. Definitely not to 4.2v. That just adds charge time and reduces battery life.

You can see these charge cycles by checking out battery charger reviews. Here is a good source.
http://www.lygte-info.dk/info/indexBatteriesAndChargers%20UK.html

In my experience, I weekly tend to run my 26650 cells down to around 3.7 volt. With my old 1A charger I’d be waiting about 5 hours. With a 2A charger it went down to about 3 hours. With a 3A charger it’s usually under 2 hours. So yeah, from 1A to 3A is not exactly 3 times faster, but it saves me over 3 hours of having to sit next to the charger either reading or watching tv, etc… which is huge. I get impatient. I’ll gladly pay more money for a faster charger. Lol

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70, Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

9 NarsilM user videos for BLF Q8, GT, GT Mini and ROT66

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ZoomieFan
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5 to 2 hours is indeed worth the trouble. And I pay extra for more speed too. Don’t get me wrong on that. I even decided to not to buy anything below 2A.
Do you really babysit your cells being charged? If yes, then extra time really counts. I just fill my chargers and leave for the day/night. So often I don’t need extreme speed. But there are times I do and need as much as I can.

What’s most informative in your post is the part about CC and CV.
Say I need to charge 8 cells asap, but I only have one 3A MiBoxer. Then it would be best to charge until about 75% and top the remaining 25% of in one of my slower chargers while the MiBoxer charges the remaining 4 cells at full speed.
Something like that?

Chargers: 1xBasen BD01 5/5,1xDodge Charger, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5
Flashlights: BLF Q8 4/5, Convoy BD04 5/5, DQG Tiny III, FiTorch MR35 3/5, Haikelite SC26 HD, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5
Waiting for: 21700 EDCs to hit the market.

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You are not supposed to leave charging cells unattended. That’s one of the rules of Liion batteries. The few people I’ve heard that charge unattended put the charger in a metal pan and put it outside or in their garage in case it catches on fire. There have been people whose house have burned down because they left it charging unattended.

Maybe I’m being a bit too precautious, but it’s easy for me to babysit them. It’s usually charge all my main cells once a week. I’ve got the one C4-12 and 2 Xtar SV2 Rocket chargers. So if I need to charge 4 × 26650 at 3A and 4 × 26350 at 1A I can do it all in one setting.

If you need to charge 8 × 18650, your idea from above sounds good and should reduce the overall charge times. Can your particular 18650 take a 3A charge? Not all can. You can look up your particular battery models data sheet to see all its specs.

Here is quick guide Mooch did.

.

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70, Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

9 NarsilM user videos for BLF Q8, GT, GT Mini and ROT66

Texas_Ace BLF Calibrated Lumen tube

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ZoomieFan
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JasonWW wrote:
Can your particular 18650 take a 3A charge? Not all can.
I have no clue…
On this forum I’ve read 1C is ok, and 0.8C advisable.
All my 18650 cells are 3500 mAh, so with that in mind I bought 2A and 3A chargers.
My LiitoKala 35A 3500 mAh cells aren’t in the list.

Chargers: 1xBasen BD01 5/5,1xDodge Charger, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5
Flashlights: BLF Q8 4/5, Convoy BD04 5/5, DQG Tiny III, FiTorch MR35 3/5, Haikelite SC26 HD, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5
Waiting for: 21700 EDCs to hit the market.

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JasonWW wrote:
You are not supposed to leave charging cells unattended. That’s one of the rules of Liion batteries. The few people I’ve heard that charge unattended put the charger in a metal pan and put it outside or in their garage in case it catches on fire. There have been people whose house have burned down because they left it charging unattended.

Maybe I’m being a bit too precautious, but it’s easy for me to babysit them. It’s usually charge all my main cells once a week. I’ve got the one C4-12 and 2 Xtar SV2 Rocket chargers. So if I need to charge 4 × 26650 at 3A and 4 × 26350 at 1A I can do it all in one setting.

If you need to charge 8 × 18650, your idea from above sounds good and should reduce the overall charge times. Can your particular 18650 take a 3A charge? Not all can. You can look up your particular battery models data sheet to see all its specs.

Here is quick guide Mooch did.

.

Thanks for the nice overview chart JasonWW! May I correct you i.a.w. the Samsung 29E? This one is specified to 8.2A instead of 2.75A.
Cheers, Thomas

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ZoomieFan wrote:
JasonWW wrote:
Can your particular 18650 take a 3A charge? Not all can.
I have no clue…
On this forum I’ve read 1C is ok, and 0.8C advisable.
All my 18650 cells are 3500 mAh, so with that in mind I bought 2A and 3A chargers.
My LiitoKala 35A 3500 mAh cells aren’t in the list.

Generally speaking, high capacity cells tend to not have very high discharge or recharge rates. What particular battery models do you have?

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

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FlashTom wrote:

Thanks for the nice overview chart JasonWW! May I correct you i.a.w. the Samsung 29E? This one is specified to 8.2A instead of 2.75A.
Cheers, Thomas

All praise goes to Mooch. This is his chart. He and HKJ are great resources for the battery community.

BTW, I have never heard of any 18650 being safe to charge at 8.2A. Are you sure about that? Maybe you are thinking of the output?

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

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Sorry for the confusion JasonWW. Of course, I meant the output and not the charge rate. Wink

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JasonWW wrote:
ZoomieFan wrote:
JasonWW wrote:
Can your particular 18650 take a 3A charge? Not all can.
I have no clue…
On this forum I’ve read 1C is ok, and 0.8C advisable.
All my 18650 cells are 3500 mAh, so with that in mind I bought 2A and 3A chargers.
My LiitoKala 35A 3500 mAh cells aren’t in the list.

Generally speaking, high capacity cells tend to not have very high discharge or recharge rates. What particular battery models do you have?

Click

They are claimed to be a “NCR 18650ga” rewarp. 10A discharge.

Chargers: 1xBasen BD01 5/5,1xDodge Charger, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5
Flashlights: BLF Q8 4/5, Convoy BD04 5/5, DQG Tiny III, FiTorch MR35 3/5, Haikelite SC26 HD, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5
Waiting for: 21700 EDCs to hit the market.

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Sharing the charging of the Lii-402 (charged a fully-discharged Sony VTC4, discharged to around or a bit below 3.0v) and then set 2A charge rate in Lii-402. Using EBD-USB+ meter to graph the charging:

Same graph (one shows charging time and the other shows mAh charged — it is measuring the Lii-402 charger, which may not exactly correspond to the charged capacity of the 18650 battery, but should correlate).

(Lii-402 appears to have a high charge terminating current (around 0.45A) when set to 2A charge rate. Although when I checked the battery voltage right after charging, I got a quite exact 4.20-4.21v.

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ZoomieFan wrote:
JasonWW wrote:
ZoomieFan wrote:
JasonWW wrote:
Can your particular 18650 take a 3A charge? Not all can.
I have no clue…
On this forum I’ve read 1C is ok, and 0.8C advisable.
All my 18650 cells are 3500 mAh, so with that in mind I bought 2A and 3A chargers.
My LiitoKala 35A 3500 mAh cells aren’t in the list.

Generally speaking, high capacity cells tend to not have very high discharge or recharge rates. What particular battery models do you have?

Click

They are claimed to be a “NCR 18650ga” rewarp. 10A discharge.


Hmm, a bit odd Liitokala is rewrapping Panny GA’s. So if we assume it’s accurate we can look up the data sheet for that cell.

I found a more detailed data sheet here.

What is odd is that it doesn’t list a max safe charging rate like other brands. Other brands will list a low charge current rate for max battery life, a standard charge current and a max charge current.

For the Panasonic NCR19650GA it appears the highest they recommend is 1.67A. If we look at the Samsung 35E it shows a similar standard charge rate of 1.7A and a max of 2A. If we look at the LG MJ1 it shows a similar standard charge rate 1.7A, but a max of 3.4A. So it really does depend on the specific model and it’s chemistry.

You might be able to charge those GA’s at 2A and be fine, but 1.5A looks like the safest rate.

Also, I did a bit of digging and it is not known if the Liitokala lii-35A is actually a Panasonic GA. It may be a 35E or even an independent cell that has similar characteristics. Thread is here.

Have you ever discharged them to about 2.8v and then measured the capacity? We’re they close to about 3200-3300mah?

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70, Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

9 NarsilM user videos for BLF Q8, GT, GT Mini and ROT66

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JasonWW wrote:

For the Panasonic NCR19650GA it appears the highest they recommend is 1.67A. If we look at the Samsung 35E it shows a similar standard charge rate of 1.7A and a max of 2A. If we look at the LG MJ1 it shows a similar standard charge rate 1.7A, but a max of 3.4A. So it really does depend on the specific model and it’s chemistry.

You might be able to charge those GA’s at 2A and be fine, but 1.5A looks like the safest rate.

Also, I did a bit of digging and it is not known if the Liitokala lii-35A is actually a Panasonic GA. It may be a 35E or even an independent cell that has similar characteristics. Thread is here.

Have you ever discharged them to about 2.8v and then measured the capacity? We’re they close to about 3200-3300mah?


Sorry I have no way to do an accurate test of any sort.

But even if the cells are really Panasonic NCR19650GA the wrapping is wrong because it states 3500 instead of 3350.
And IF the cell is genuine charging at 3A with my MiBoxer isn’t a smart thing to do, because that’s almost double of what’s safest. While I don’t babysit cells all the time, I do sometimes. On a few occasions I touched them and they weren’t hot, not even warm. So that’s a little good news I think.

Anyway, when time is no issue I’ll charge at 1A. And I must say often time is no issue at all. Even less now because I bought 7 more cells. That vastly reduces the need for quick recharge during the day. But the babysitting them remains a problem.
Is it so that charging at 1A reduces the risk of fire? Or is it more an age related problem? I don’t remember which one but when looking for a charger one description stated the charger shuts down after X minutes no matter how far the battery is charged because of safety reasons.

Chargers: 1xBasen BD01 5/5,1xDodge Charger, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5
Flashlights: BLF Q8 4/5, Convoy BD04 5/5, DQG Tiny III, FiTorch MR35 3/5, Haikelite SC26 HD, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5
Waiting for: 21700 EDCs to hit the market.

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ZoomieFan wrote:

Sorry I have no way to do an accurate test of any sort.

You have the C4-12, right? It measures capacity.
ZoomieFan wrote:

But even if the cells are really Panasonic NCR19650GA the wrapping is wrong because it states 3500 instead of 3350.
And IF the cell is genuine charging at 3A with my MiBoxer isn’t a smart thing to do, because that’s almost double of what’s safest. While I don’t babysit cells all the time, I do sometimes. On a few occasions I touched them and they weren’t hot, not even warm. So that’s a little good news I think.

Anyway, when time is no issue I’ll charge at 1A. And I must say often time is no issue at all. Even less now because I bought 7 more cells. That vastly reduces the need for quick recharge during the day. But the babysitting them remains a problem.
Is it so that charging at 1A reduces the risk of fire? Or is it more an age related problem? I don’t remember which one but when looking for a charger one description stated the charger shuts down after X minutes no matter how far the battery is charged because of safety reasons.


The wrapper and rating of 3500mah for the GA is still “accurate” as they measured 3450mah in the labratory. In the real world they can vary a bit. HKJ measured 3350mah, but he started at 2.8v instead of 2.5v or so. I forget the details.

That’s why I said if you start at 2.8v and get 3200 to 3300 your doing pretty good regardless of the actual cell in the wrapper.

A fire is possible any time, any charge rate, any battery age, etc…

As a side note, unless you running your batteries down below 3.2v or so, your not really using all that capacity. I don’t usually run my cells that low so I use the Samsung 30Q. They do more amperage (15A continous), have less voltage sag under load and can be charged at up to 4A. Thumbs Up

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware (old), lighted side switch and cut down SMO reflector. Lots of amp draws on stock driver as well. 

My Supfire L5-S thread with XHP70, Texas Avenger FET driver, NarsilM v1.0 ramping firmware and lighted side switch. My mini L6! 

9 NarsilM user videos for BLF Q8, GT, GT Mini and ROT66

Texas_Ace BLF Calibrated Lumen tube

Maukka Calibration Lights for DIY Lumen Measuring Devices

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