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

616 posts / 0 new
Last post
jmm244
Offline
Last seen: 2 days 14 hours ago
Joined: 07/23/2012 - 22:39
Posts: 128
Location: US North Coast

There's so much stuff going on with these charges, sometimes it makes my head hurt:

1) It's not just the Samsung 30Q button tops that exhibit problems in my higher powered Miboxers, the Sony VTC6s button tops that came with my Haikelite MT09R behave similarly, though with slightly lower, and less frequent high resistance/impedance readings and the resulting undesirably low charge rates.

 2) The problems I observe with 30Qs et al. seem to be much worse when "topping up" or when charging rested batteries than when recharging THE SAME batteries fresh off a more deeply discharged state. For instance, I cleaned the contacts and inserted, then reinserted (multiple times) some Liionwholesale 30Qs that has been sitting around for a month (4.16V resting voltage) into my Miboxer C2-6000 (I decided to avoid the more extreme variability problems of the C4-12s #3 slot, and my C2-6000 seems a bit better behaved in general). They initially displayed internal resistance ranging from about about 80 to 230 mOhms, but pushing the 230 one against the negative contact spring to break the connection and then allowing it to reconnect produced internal resistance readings of ~150>130>110>90 and it finally "stabilized" at around 85 mOhms. I let them charge fully (<1A rates autoselected), then put all four of them into an 4S MT09R and drained the set to about 3.56V. When reinserted into the C2-6000 they ALL now displayed an "inset with no fiddling" internal resistance of 28 to 32 mOhms, and autoselected a charge rate of 3A (which I bumped down to 1.5A). So I let the fist two 30Qs fully charge, removed them and inserted the remaining ones that had measured ~30 mOhms 30 minutes earlier when they were still warm from the light, and they now measured 110 & 230 mOhms! By multiple reinserts I was able to got both to register as as ~88 and 110 mOhms, but they wouldn't take 3A charge rate they had when they were warm. As they charged, their displayed MOhm readings dropped to 40 and 91.

It looks like the variability we are seeing with these chargers might be being caused by more than just the possibility of any added resistance of button top caps conversions. Battery chemistry (IMR/INR etc), battery temperature, battery resting state and who knows what else may all play a role in and have an affect on how the Miboxer firmware decides to charge any particular battery at any particular time, and how much control you may be able to exercise over that process.

   

 

     

ssschen
ssschen's picture
Offline
Last seen: 1 hour 35 min ago
Joined: 09/10/2017 - 22:11
Posts: 337
Location: Australia
Pete7874 wrote:
ssschen wrote:
I have had my 30Q reached 60C and no reboot was observed. This was during the day when the ambient temperature was in the high 20s C (maybe even low 30s). Ever since I observed the temperature getting that high, I have stopped charging my batteries with it set to auto during the day just to be on the safe side.
What’s the reported IR of your 30Q cells?

3 of the cells were reported by the C4-12 as 29 mOhms, one is slightly higher at 31 mOhms. See this post I put up a couple of days ago.

I will go out for another long walk later tonight with the BLF Q8 to drain the batteries down a bit, and will put it on the charger afterwards to get another set of IR readings.

maukka
maukka's picture
Online
Last seen: 13 min 42 sec ago
Joined: 12/31/2015 - 04:15
Posts: 1240
Location: Finland
bushmaster wrote:
In reference to button top cells that exhibit high IR, can the button top itself cause the high IR or must it be an internal characteristic?

I’ve measured my own batteries before and after spot welding. A well done spot welded button top will not increase IR any meaningful amount.

Flying Luminosity
Flying Luminosity's picture
Offline
Last seen: 2 months 1 day ago
Joined: 09/12/2017 - 13:33
Posts: 330
Location: UK
maukka wrote:
I’ve measured my own batteries before and after spot welding. A well done spot welded button top will not increase IR any meaningful amount.

A new plot twist to this ongoing thriller…

­*munchingpopcorn*

teacher
teacher's picture
Online
Last seen: 4 min 48 sec ago
Joined: 02/23/2016 - 19:04
Posts: 5539
Location: NE & SW Alabama

jmm244 wrote:

(snip)

Just another case where a flawed implementation of uber high-tech good intentions interfere with, rather than facilitate the task at hand.

Exactly…. Thumbs Up

As far as I am concerned the charger automatically choosing a charge rate is a useless feature. Just “bells & whistles” that are not needed & cause problems.

Like Jason suggested…. do away with the charger automatically choosing a charge rate. Have a set default charge rate that can be easily changed by the user. Who needs, or really wants; a charger that chooses charge rates anyway. Especially when it just creates problems. Facepalm
I know I do not.

The 3A charging in each bay is a great plus for this charger.

I was & still am impressed with that. BUT after reading all this about the problems & discrepancies with the ‘extra “super smart” bells & whistles’….. I have changed my mind totally about wanting one of these. Sad

I will pass…… Wink

      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"

       Texas Lumens Flashlights  <>   M4D M4X Deals : sign up - save $$$$    ||||

         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                                                       

joymart
joymart's picture
Offline
Last seen: 2 months 4 weeks ago
Joined: 04/11/2018 - 23:50
Posts: 7
Location: New York

you should review it on this theard

Dia chi ban den trang tri gia re uy tin, chat luong tai Ha Noi.

Sales-Miboxer
Sales-Miboxer's picture
Offline
Last seen: 1 month 4 weeks ago
Joined: 03/10/2017 - 05:10
Posts: 96
Location: China

joymart wrote:
you should review it on this theard

 

HKJ have reviewed it : https://lygte-info.dk/review/Review%20Charger%20Miboxer%20C4-12%20UK.html 

Please sent email any question:sales@miboxer.com

teacher
teacher's picture
Online
Last seen: 4 min 48 sec ago
Joined: 02/23/2016 - 19:04
Posts: 5539
Location: NE & SW Alabama

Sales-Miboxer wrote:

teacher wrote:
jmm244 wrote:
_ Just another case where a flawed implementation of uber high-tech good intentions interfere with, rather than facilitate the task at hand.
Exactly…. Thumbs Up _+As far as I am concerned+ the charger automatically choosing a charge rate is a useless feature. Just “bells & whistles” that are not needed & cause problems. Like Jason suggested…. do away with the charger automatically choosing a charge rate. Have a set default charge rate that can be easily changed by the user. Who needs, or really wants; a charger that chooses charge rates anyway. Especially when it just creates problems. Facepalm I know I do not. The 3A charging in each bay is a great plus for this charger. I was & still am impressed with that. BUT after reading all this about the problems & discrepancies with the ‘extra “super smart” bells & whistles’….. I have changed my mind totally about wanting one of these. Sad I will pass…… Wink
Yes, I agree with you, the automatically choosing a charge rate is a useless feature.
If you ever make a charger similar to this (4 bays that can charge each bay at 3A) but does away with the ‘automatic’ part & also measures ‘discharge capacity’….. I will be first in line to buy one. Thumbs Up .. Smile

      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"

       Texas Lumens Flashlights  <>   M4D M4X Deals : sign up - save $$$$    ||||

         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                                                       

tatasal
Online
Last seen: 10 min 58 sec ago
Joined: 02/15/2012 - 08:40
Posts: 4365
Location: Far East
teacher wrote:
Sales-Miboxer wrote:

teacher wrote:
jmm244 wrote:
_ Just another case where a flawed implementation of uber high-tech good intentions interfere with, rather than facilitate the task at hand.
Exactly…. Thumbs Up _+As far as I am concerned+ the charger automatically choosing a charge rate is a useless feature. Just “bells & whistles” that are not needed & cause problems. Like Jason suggested…. do away with the charger automatically choosing a charge rate. Have a set default charge rate that can be easily changed by the user. Who needs, or really wants; a charger that chooses charge rates anyway. Especially when it just creates problems. Facepalm I know I do not. The 3A charging in each bay is a great plus for this charger. I was & still am impressed with that. BUT after reading all this about the problems & discrepancies with the ‘extra “super smart” bells & whistles’….. I have changed my mind totally about wanting one of these. Sad I will pass…… Wink
Yes, I agree with you, the automatically choosing a charge rate is a useless feature.
If you ever make a charger similar to this (4 bays that can charge each bay at 3A) but does away with the ‘automatic’ part & also measures ‘discharge capacity’….. I will be first in line to buy one. Thumbs Up .. Smile

My friend, if only you happen to live near me, I’d be happy to lend you my C4-12 and test its “Auto” and Manual over-ride features… I’ll bet you a few bucks that your opinion regardless this charger will not remain as such after using it.

Don’t let the ultra-conservative setting of its charging rate scare you….it only happens to cells with substantially high IR (which you can also Manually override btw) on problematic ‘protected’ cells….but it’s a breeze to use in your ‘normal’ protected cells, and more with your unprotecteds…wheeew…it’s a breeze, believe me.

dchomak
Offline
Last seen: 3 weeks 18 hours ago
Joined: 03/17/2012 - 20:10
Posts: 4124
Location: Connecticut

^
+1

BTW the reason for the automatic mode, I believe, is for the rookies that do not know the ins and outs of rapid cell charging.
IMR type cells with low IR can take large charging currents. In fact, tool pack chargers usually charge them at rates higher than 3A.
Cells used in laptop battery packs tend to be ICR types and can not stand the higher charge rates. By default this charger uses the measured IR of the cell to choose what rate it should be charged at. IMR = low IR, ICR = higher IR
That default is easily overridden for those that wish to do so. The best of both worlds.

Also, damaged or well used or old cells develop a higher internal resistance. Those cells should not be charged at higher rates also, and this charger by default will recognize that and automatically adjust.

teacher
teacher's picture
Online
Last seen: 4 min 48 sec ago
Joined: 02/23/2016 - 19:04
Posts: 5539
Location: NE & SW Alabama

Hmmmm…… Thanks for that info about the ‘Auto Default’ being easily overridden tatasal & dchomak. Thumbs Up

That sheds new light on the subject. I had assumed (incorrectly it appears) from my reading it was a pain in the arse to override the auto function.

I may well go ahead & get one, because the possibility to charge at 3A is very attractive indeed!!

Thanks again for the info. Smile

      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"

       Texas Lumens Flashlights  <>   M4D M4X Deals : sign up - save $$$$    ||||

         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                                                       

Pete7874
Pete7874's picture
Offline
Last seen: 26 min 33 sec ago
Joined: 11/23/2011 - 16:47
Posts: 1571
Location: USA

teacher wrote:
I had assumed (incorrectly it appears) from my reading it was a pain in the arse to override the auto function.

While selecting the charge current manually is easy, some people reported that it does not ‘stick’:
http://budgetlightforum.com/comment/1307711#comment-1307711
teacher
teacher's picture
Online
Last seen: 4 min 48 sec ago
Joined: 02/23/2016 - 19:04
Posts: 5539
Location: NE & SW Alabama

Pete7874 wrote:
teacher wrote:
I had assumed (incorrectly it appears) from my reading it was a pain in the arse to override the auto function.
While selecting the charge current manually is easy, some people reported that it does not ‘stick’:
http://budgetlightforum.com/comment/1307711#comment-1307711
Hmmm…. Thanks for that info Pete. Thumbs Up
It does indeed say that. Sad

And, if I am reading it correctly; he seems to say that was fixed on a later edition. BUT the max charge rate was only 800mAh when set manually.

IF that is correct….. that would defeat the purpose for me. The purpose (for me) being able to charge at 3A setting charge rate manually.

.

jmm244 wrote:
Pete7874 wrote:
…You just have to remember to set the rate manually then.
Usually doesn’t work with my C4-12. Manually selected override rates for my 30Qs and other problematic cells will fall back down within a minute.

There appears to be an improvement in the newer style C4 firmware though, as manual overrides do stick in that one, but it’s only an 800 mA maximum rate charger.

      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"

       Texas Lumens Flashlights  <>   M4D M4X Deals : sign up - save $$$$    ||||

         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                                                       

JasonWW
JasonWW's picture
Online
Last seen: 8 min 1 sec ago
Joined: 10/22/2016 - 11:41
Posts: 6594
Location: Houston Texas

teacher wrote:

And, if I am reading it correctly; he seems to say that was fixed on a later edition. BUT the max charge rate was only 800mAh when set manually.

IF that is correct….. that would defeat the purpose for me. The purpose (for me) being able to charge at 3A setting charge rate manually.


Your not reading it correctly. He said the software on the newer C4, not C4-12, has a max charge rate of 800mAh. The C4 is an older unit.

It’s also important to note that max charge rates are only used below 4v or 4.1v. The charge rate tapers off as it reaches full charge. Texas_Ace used to think the manual charge rates did not stick either, but he was usually just topping of the cells.

jmm244’s issue of the charge rate not sticking on certain cells seems to be caused by the charger reading way too high an internal resistance. When that happens these chargers can act pretty screwy.

I mainly bought my C4-12 to charge my unprotected 26650 cells as they can use that 3A charge rate and it works great for that. It really cuts down on the charge times.

Luckily all my protected button top 18650 read under 150milliOhms (120-145 usually). If they read higher, I reset it and that will get it under 150.

Maybe everyone needs at least a 2nd charger, a more basic one, that can be used for their funny acting cells?

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware, 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 including GT 

Texas_Ace BLF Calibrated Lumen tube

 

jmm244
Offline
Last seen: 2 days 14 hours ago
Joined: 07/23/2012 - 22:39
Posts: 128
Location: US North Coast
teacher wrote:
…If you ever make a charger similar to this (4 bays that can charge each bay at 3A) but does away with the ‘automatic’ part & also measures ‘discharge capacity’….. I will be first in line to buy one. Thumbs Up .. Smile

Uh-oh, looks like there’s going to be a fight for that one, if it happens Wink

The unequivocally positive “reviews” given to the C4-12 charger by some people sometimes bother me, until I remember that I have about 130 batteries that would lead me to the same conclusion, IF that’s all I had. Unfortunately, I have about 70 batteries that drive my C4-12 nuts, and they happen to be among my most robust, reliable and frequently used batteries. My C4-12 absolutely loves the “average” and few crap batteries I have, exhibiting few if any problems with them, even in slot #3.

Although I’d prefer the full manual approach specified by teacher, I’d probably settle for just being able to override a low charge rate on my C4-12 and have it stick. I wonder if they have addressed that problem in later versions of the C4-12 , or if the people who don’t seem to understand that particular issue just don’t have any of the batteries that cause it to show up?

I initially thought the internal resistance display capability of these chargers would be a good way of keeping track of battery ageing, but I’ve been put off a bit after reinserting the SAME battery 10 times within ~3 minutes and seeing readings from 999 to 30 mOhms. Like may other things though, the truth is in there somewhere, and you just have to learn to filter out the obvious crap readings.

teacher
teacher's picture
Online
Last seen: 4 min 48 sec ago
Joined: 02/23/2016 - 19:04
Posts: 5539
Location: NE & SW Alabama

Thanks Jason… I sure was reading it wrong. Facepalm .. Big Smile

As I have a more than ample number of chargers, that is the reason I considered this one…. to be able to charge at 3A.

And that would mostly be my 26650 cells with 18650’s occasionally being charged at 3A also.

      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"

       Texas Lumens Flashlights  <>   M4D M4X Deals : sign up - save $$$$    ||||

         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                                                       

Sales-Miboxer
Sales-Miboxer's picture
Offline
Last seen: 1 month 4 weeks ago
Joined: 03/10/2017 - 05:10
Posts: 96
Location: China

Coming soon: C4-12 v2 ( compatible with Li-ion 4.35V and LiFePo4 cells)

Please sent email any question:sales@miboxer.com

StandardBattery
Offline
Last seen: 2 months 1 week ago
Joined: 11/02/2016 - 08:51
Posts: 167
Location: MA, USA

Sales-Miboxer wrote:

Coming soon: C4-12 v2 ( compatible with Li-ion 4.35V and LiFePo4 cells)


Add discharge/capacity-analysis and you have a useful update.
tatasal
Online
Last seen: 10 min 58 sec ago
Joined: 02/15/2012 - 08:40
Posts: 4365
Location: Far East
StandardBattery wrote:
Sales-Miboxer wrote:

Coming soon: C4-12 v2 ( compatible with Li-ion 4.35V and LiFePo4 cells)

Add discharge/capacity-analysis and you have a useful update.

That would be an entirely different, new model.

Sales-Miboxer
Sales-Miboxer's picture
Offline
Last seen: 1 month 4 weeks ago
Joined: 03/10/2017 - 05:10
Posts: 96
Location: China

StandardBattery wrote:
Sales-Miboxer wrote:

Coming soon: C4-12 v2 ( compatible with Li-ion 4.35V and LiFePo4 cells)

Add discharge/capacity-analysis and you have a useful update.

 

hahaha, budgetlightforum, don't forget the budget.

Please sent email any question:sales@miboxer.com

tatasal
Online
Last seen: 10 min 58 sec ago
Joined: 02/15/2012 - 08:40
Posts: 4365
Location: Far East
Sales-Miboxer wrote:

StandardBattery wrote:
Sales-Miboxer wrote:

Coming soon: C4-12 v2 ( compatible with Li-ion 4.35V and LiFePo4 cells)


Add discharge/capacity-analysis and you have a useful update.

 


hahaha, budgetlightforum, don’t forget the budget.

Haha, BLF is no longer “the” Budget Light forum it used to be.

Give us a perhaps sub-$75 MiBoxer quality charger/analyzer, and you’ll give everyone a run for their money.

For those who doesn’t want it, there’s always the regular C4.

JasonWW
JasonWW's picture
Online
Last seen: 8 min 1 sec ago
Joined: 10/22/2016 - 11:41
Posts: 6594
Location: Houston Texas

StandardBattery wrote:
Sales-Miboxer wrote:

Coming soon: C4-12 v2 ( compatible with Li-ion 4.35V and LiFePo4 cells)


Add discharge/capacity-analysis and you have a useful update.

I don’t need an analysis feature. I don’t think I need the new voltage settings either.

We were actually talking earlier about removing features from the C4-12 in order to make it more reliable. We all like the high powered charging and all of the 11 or 12 different charge rates, but certain batteries, like button top 18650, seem to read unusually high internal resistance. This can make the charger software act funny. I like the idea of removing the automatic charge rate feature and just setting the charge rates manually. I pretty much set them manually anyway.

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware, 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 including GT 

Texas_Ace BLF Calibrated Lumen tube

 

tatasal
Online
Last seen: 10 min 58 sec ago
Joined: 02/15/2012 - 08:40
Posts: 4365
Location: Far East

JasonWW wrote:
StandardBattery wrote:
Sales-Miboxer wrote:

Coming soon: C4-12 v2 ( compatible with Li-ion 4.35V and LiFePo4 cells)


Add discharge/capacity-analysis and you have a useful update.

I don’t need an analysis feature. I don’t think I need the new voltage settings either.

We were actually talking earlier about removing features from the C4-12 in order to make it more reliable. We all like the high powered charging and all of the 11 or 12 different charge rates, but certain batteries, like button top 18650, seem to read unusually high internal resistance. This can make the charger software act funny. I like the idea of removing the automatic charge rate feature and just setting the charge rates manually. I pretty much set them manually anyway.

Or they can upgrade the firmware to not be too sensitive to high IR from protected cells so as not become too conservative in selecting the auto charging rates.

So far the C4-12’s over-sensitivity in Auto mode to high IR’ed cells is the only main concern of this otherwise superb charger, IMO.

I for one personally like this “Auto” feature very much, specially if the bugs are ironed out ( I only have 5 protecteds, btw, and all high in IR!).

JasonWW
JasonWW's picture
Online
Last seen: 8 min 1 sec ago
Joined: 10/22/2016 - 11:41
Posts: 6594
Location: Houston Texas

What if the problem is not in the firmware? It could be in the slider design or something else.

In general I agree, Miboxer should focus on getting the existing bugs worked out of the current design before trying to add new features.

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware, 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 including GT 

Texas_Ace BLF Calibrated Lumen tube

 

teacher
teacher's picture
Online
Last seen: 4 min 48 sec ago
Joined: 02/23/2016 - 19:04
Posts: 5539
Location: NE & SW Alabama

StandardBattery wrote:
Sales-Miboxer wrote:

Coming soon: C4-12 v2 ( compatible with Li-ion 4.35V and LiFePo4 cells)


Add discharge/capacity-analysis and you have a useful update.
+1
If it takes a new model…. go for it. Wink

      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"

       Texas Lumens Flashlights  <>   M4D M4X Deals : sign up - save $$$$    ||||

         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                                                       

rizky_p
rizky_p's picture
Offline
Last seen: 1 day 8 hours ago
Joined: 03/01/2011 - 05:06
Posts: 906
Location: Indonesia

well i want a charger with build it flashlight. Silly we got many flashlights with build in charger already

JasonWW
JasonWW's picture
Online
Last seen: 8 min 1 sec ago
Joined: 10/22/2016 - 11:41
Posts: 6594
Location: Houston Texas

Hey guys, I got Mike’s 30Q’s in and they are reading inconsistently. They are mostly under 100 milli ohms, but one is a bit more erratic. I took off the extra wrapper and I ran into a problem.

It seems Mtn Elec button top 30Q are spot welded in 4 points. This should be the most reliable method of attaching a button top and give the least amount of extra resistance, but appearantly it’s not.

Now I’m trying to figure out the best way to remove it without damaging the factory wrapper.

Any suggestions?

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware, 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 including GT 

Texas_Ace BLF Calibrated Lumen tube

 

JasonWW
JasonWW's picture
Online
Last seen: 8 min 1 sec ago
Joined: 10/22/2016 - 11:41
Posts: 6594
Location: Houston Texas

Hey, I found the problem! It looks like the spot welds did not penetrate enough. I was able to take a micro screwdriver and pry underneath the tab and it popped right off. That would definitely explain the extra resistance. Now let’s hope the other three cells are just as easy. (EDIT, they were not)


.

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware, 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 including GT 

Texas_Ace BLF Calibrated Lumen tube

 

bushmaster
bushmaster's picture
Offline
Last seen: 54 min 11 sec ago
Joined: 07/09/2017 - 15:40
Posts: 215
Location: Colville, WA USA

Well……..it seems that this might answer some of our questions.

Keep your nose in the wind and your eyes along the skyline.
Del Gue

JasonWW
JasonWW's picture
Online
Last seen: 8 min 1 sec ago
Joined: 10/22/2016 - 11:41
Posts: 6594
Location: Houston Texas

Okay, after cleaning off both ends of each battery I tested them out in my own C4-12 charger three times each and they all read very consistently with low internal resistance and they all automatically switched to the 3 amp charge rate.

35 47 27
27 34 44
39 43 32
31 33 39

27 to 47 might seem like a big swing, but for this charger I’d say it’s more than fine.

Now to do the solder blobs. I don’t expect the resistance to change any but I’ll test each cell multiple times afterwards just to confirm.

My Convoy L6 thread with XHP70.2, Texas Avenger FET driver, Narsil v1.2 ramping firmware, 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 including GT 

Texas_Ace BLF Calibrated Lumen tube

 

Pages