*BLF LT1 Lantern Project* (codes going out for more LT1s, second batch shipping!)

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DBSAR
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lionheart_2281 wrote:
sueli428 wrote:
Is there a way to tell if the LT1 is utilizing all 4 batteries that are installed or not?

Charge all batteries to 4.20

Put on high for an hour

Remove batteries and check individual voltages

Thumbs Up

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

cm02WS6
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I just bit the bullet and ordered one from Sofirn’s new direct site! Trying not to be too excited because I’m sure it will be even longer to get here due to Chinese New Year.

Also ordered some LG MJ1 button tops from Liion Wholesale’s flash sale.

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cm02WS6 wrote:
I just bit the bullet and ordered one from Sofirn’s new direct site! Trying not to be too excited because I’m sure it will be even longer to get here due to Chinese New Year.


I ordered one direct from Sofirn 12/31, and today it left China on a plane. You may get lucky and leave there before CNY.

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

gravelmonkey
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lionheart_2281 wrote:
sueli428 wrote:
Is there a way to tell if the LT1 is utilizing all 4 batteries that are installed or not?

Charge all batteries to 4.20

Put on high for an hour

Remove batteries and check individual voltages

Would removing the tailcap and spring MPCB, and then testing voltage between the body and negative end of each of the cells work?

I’m thinking that if the positive end of the cell isn’t making contact, you’ll get a reading of 0V.

sueli428
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lionheart_2281 wrote:
sueli428 wrote:
Is there a way to tell if the LT1 is utilizing all 4 batteries that are installed or not?

Charge all batteries to 4.20

Put on high for an hour

Remove batteries and check individual voltages

Ok thanks. Wasn’t sure if the lantern reported that info also or just voltage.

sbslider wrote:
unless you intentionally put an insulator on one of the batteries the LT1 will use all installed batteries for power. Lionheart suggests a good way to prove it.

Was thinking if there was a bad cell that wasn’t working, since the lantern will work with any number of batteries. I guess if the battery holds a charge then that means it is good.

Melven
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I accidentally fixed my orange O-ring so it fits my LT1 perfectly. It fell off and I put it in my back pocket on my pants. I forgot it was there and it went through the washer and dryer. When I found it again, it had shrunk and now fits the slot perfectly!

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bakeshow wrote:
Has anyone else run into this issue? I noticed some of my batteries were rattling in my second LT1 and it looks like the springs are super compressed.

That is what happens when battery cells are inserted with alternating polarity — two springs end up melted. It’s likely that that happened at some point.

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Best guess scenario…least chance for validation. requires responsibility.

leftdisconnected
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bakeshow wrote:


Cpeng wrote:

It looks like the springs were burned…

+1. The springs have the usual discoloration and shape change caused by high heat concentrated around the battery contact area. I’m not blaming the user as perhaps it wasn’t your fault, but I believe these springs were damaged by reversed cells or by some other short-circuit situation.

Your cells probably need solder blobs to avoid hitting the LED pot, as well. First thing I did to my LT1 was desolder that pot, as I just don’t trust it with my laptop pulls with solder blobs.

The wraps appear slightly damaged around the top rim. Though they may have been damaged when pulling the cells from a laptop pack, they might also be hitting the positive ring and the rims appear to be the same height as the battery terminals, which is typical of flat-top laptop pulls. If so, this will eventually cause a short and is another reason to add blobs. Magnets should not be used in this case as they are often dislodged and may turn the lantern into a tiny furnace.

RobAllen

cm64
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Melven wrote:
I accidentally fixed my orange O-ring so it fits my LT1 perfectly. It fell off and I put it in my back pocket on my pants. I forgot it was there and it went through the washer and dryer. When I found it again, it had shrunk and now fits the slot perfectly!

LOL Excellent solution.
Now we need details of the wash & dryer cycle Smile

Melven
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I just washed and dried on the regular setting – so the dryer was hot and the washer was warm.

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Melven wrote:
I accidentally fixed my orange O-ring so it fits my LT1 perfectly. It fell off and I put it in my back pocket on my pants. I forgot it was there and it went through the washer and dryer. When I found it again, it had shrunk and now fits the slot perfectly!
Big Smile Thumbs Up Beer

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

Serifus
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How long until there is lt1 maxx using 4×21700’s because i think it would be lolsy to have a lantern with 20ah battery life

DBSAR
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Serifus wrote:
How long until there is lt1 maxx using 4×21700’s because i think it would be lolsy to have a lantern with 20ah battery life

that cell format may be possible for the LT2 ( Deluxe) version planned, that will have the power bank option. a 20ah power bank/lantern has some real benefits for run times and charging capacity. Thumbs Up

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

cu42
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DBSAR wrote:
Serifus wrote:
How long until there is lt1 maxx using 4×21700’s because i think it would be lolsy to have a lantern with 20ah battery life

that cell format may be possible for the LT2 ( Deluxe) version planned, that will have the power bank option. a 20ah power bank/lantern has some real benefits for run times and charging capacity. Thumbs Up

Agree with ALL this 100%
Count me in. …again… Thumbs Up Facepalm

alternety
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One small possibility. Some cells were sold that had wrappers that seemed possible to confuse unskilled users as to the correct orientation.

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17 days from placing my order to my mailbox in ‘the South’ US…..
That has to be some kind of record! Thumbs Up Beer
Thanks Sofrin for getting it out before CNY.

Im not a Pessimist …. just an Optimist with a lot of experience

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Hey folks I received a round one amazon code with batteries but my wallet wasn’t free enough for me to buy a lantern till today but I can’t seem to find an Amazon listing for the lantern, did I miss my chance to get one?

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You can get one at Sofirnlight.com, and they have a coupon that makes the price the same as the group buy. I haven’t checked Amazon, and got sort of tired of the code business. They all ship from China, so I don’t think Amazon would save time.

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

Old Davo
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swiftblade13 wrote:
Hey folks I received a round one amazon code with batteries but my wallet wasn’t free enough for me to buy a lantern till today but I can’t seem to find an Amazon listing for the lantern, did I miss my chance to get one?

I ordered another with batteries yesterday. Although they are currently not available according to this page

And then I get this email a few minutes ago.

Quote:
I am sorry to inform you that this flashlight you ordered will take 2~3months to your place because the coming of CNY holiday. Please show your opinion as follows:

1, wait for it within 2~3 months;
2,Cancel this order, and then the refund would be sent to you.

Looking forward to your reply.

Regards!
Vivi

How long do the CNY celebrations run for? And why would Sofirn stop taking orders? If I cancel the Amazon orders and order from Sofirnstore.com will they come any sooner?

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I also encountered the same problem, because there is no stock currently, so I have to wait for the next batch. I also hope that it is the new version of LT2?

P.S The Lunar New Year holidays are on 1/24 ~ 1/29.

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DBSAR wrote:
The LT1 runs the cells in Parallel, and keeps the cells all at the same voltage.

What about if I unscrewed the base the small amount just until the power button light goes out, will it still keep the cells balanced at the same voltage?

sueli428
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DBSAR wrote:
Serifus wrote:
How long until there is lt1 maxx using 4×21700’s because i think it would be lolsy to have a lantern with 20ah battery life

that cell format may be possible for the LT2 ( Deluxe) version planned, that will have the power bank option. a 20ah power bank/lantern has some real benefits for run times and charging capacity. Thumbs Up

+1 on the LT2 extended super deluxe extra ultra mega max version

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sueli428][quote=DBSAR] The LT1 runs the cells in Parallel, and keeps the cells all at the same voltage.[quote wrote:

What about if I unscrewed the base the small amount just until the power button light goes out, will it still keep the cells balanced at the same voltage?

If the cells are any good at all they should stay in balance even if they were removed from the light and stored separately for months. The few times I have bothered to record and check cells that have been stored for 6 to 12 months they have remained within hundreths of volts of each other. That is nothing to worry about.

Unscrewing one end or the other until the button light goes out mainly removes the parasitic load the button led causes. But that is so low a draw I would not worry about it unless I was putting the light away for an indeterminate period. Mine are mainly meant to be emergency use lights although I will also use them here and there and for camping. As such I want them mostly charged and available.

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sueli428 wrote:
DBSAR wrote:
The LT1 runs the cells in Parallel, and keeps the cells all at the same voltage.

What about if I unscrewed the base the small amount just until the power button light goes out, will it still keep the cells balanced at the same voltage?


This post inspired me to check my laptop pulls and recycle bin scavenged 18650 cells. 5 months ago I charged them all in my charger, and measured the voltage after they rested a bit. I’ve measured them a handful of times since then. Of the about 50 cells I originally tested, one had issues with the voltage dropping with time, I found that in the first week. I just measured 32 cells that haven’t been used since they were charged 5 months ago. There were 4 different groups of cells. The groups of cells were different part numbers from a couple of different cell manufacturers. Samsung ICR18650-28A, LGABC21865, LGDBB31865, and one I didn’t note. within each group or cells, the voltage difference between cells was 0.01V or less. For all 32 cells, the voltage ranged from 4.17 to 4.13 V. If you connected two cells in parallel with that difference you would not have any trouble.

I also measured 4 cells (ICR18650-26H) I used in my LT1 for the first month or so, then I switched over to some higher capacity cells. The 4 I measured were all from the same battery pack. The measured between 3.856 and 3.857 volts.

Data that supports MtnDon’s assertion in the previous post, don’t sweat it.

PocketSammich wrote: I don’t need this, but I want it. Please sign me up.

DBSAR
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sueli428][quote=DBSAR] The LT1 runs the cells in Parallel, and keeps the cells all at the same voltage.[quote wrote:

What about if I unscrewed the base the small amount just until the power button light goes out, will it still keep the cells balanced at the same voltage?

Yes, as long as you only un-thread it a couple turns or less. the four cells will still be on contact with the base springs, (all connected together) and the cells will stay contacted with the positive ring on the driver, they will be kept in the same balance voltage. ( i have tested this already) same applied to the BLF Q8, or even the original Sky Ray King for that matter. The only part that “locks out” when loosened a bit is the battery body upper-most bare edge disconnects from the negative outside ring of the driver near the threads.

That Canadian flashlight guy & Lantern Guru -Den / DBSARlight

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sbslider wrote:
They all ship from China, so I don’t think Amazon would save time.

I can confirm. I ordered via Amazon and it took 6 weeks to get the light.
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Coscar wrote:
17 days from placing my order to my mailbox in ‘the South’ US…..
That has to be some kind of record! Thumbs Up Beer
Thanks Sofrin for getting it out before CNY.

Because you placed you order early. You are lucky.
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Old Davo wrote:
swiftblade13 wrote:
Hey folks I received a round one amazon code with batteries but my wallet wasn’t free enough for me to buy a lantern till today but I can’t seem to find an Amazon listing for the lantern, did I miss my chance to get one?

I ordered another with batteries yesterday. Although they are currently not available according to this page

And then I get this email a few minutes ago.

Quote:
I am sorry to inform you that this flashlight you ordered will take 2~3months to your place because the coming of CNY holiday. Please show your opinion as follows:

1, wait for it within 2~3 months;
2,Cancel this order, and then the refund would be sent to you.

Looking forward to your reply.

Regards!
Vivi

How long do the CNY celebrations run for? And why would Sofirn stop taking orders? If I cancel the Amazon orders and order from Sofirnstore.com will they come any sooner?


CNY holiday lasts for 10 days. But LT1 is out of stock now. It is estimated that LT1 lantern will be avaible early March. Thanks for your patience.
sueli428
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DBSAR][quote=sueli428][quote=DBSAR wrote:
The LT1 runs the cells in Parallel, and keeps the cells all at the same voltage.
Quote:

What about if I unscrewed the base the small amount just until the power button light goes out, will it still keep the cells balanced at the same voltage?

Yes, as long as you only un-thread it a couple turns or less. the four cells will still be on contact with the base springs, (all connected together) and the cells will stay contacted with the positive ring on the driver, they will be kept in the same balance voltage. ( i have tested this already) same applied to the BLF Q8, or even the original Sky Ray King for that matter. The only part that “locks out” when loosened a bit is the battery body upper-most bare edge disconnects from the negative outside ring of the driver near the threads.

That is good to know.

Thanks to everyone that helped me me get things figured out. It is up and running now and I really like it. I will mostly be using it for emergency’s and camping like MtnDon.

Good work to everyone that made it happen. Good brightness, runtime, tint options, charging, and design. Very practical.

Maybe a consolidated faq questions and answer details thread would have been useful for a noob like myself not familiar with all of the technical info scattered about. Thought about putting something together since I have asked so many questions, but most people here already seem to know most of the stuff I was asking about.

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