*BLF LT1 Lantern Project) (updated Nov,17,2020)

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kat
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Does anyone know if usb charging does balancing of the 18650 cells?
And why does the power button stay lit all the time? Doesn’t that consume battery when off?

stagger
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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

Any updates on a 21700 LT2 version? Big Smile

pol77
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The way the batteries are connected in parallel, there is no way to do any balancing, so definitely no.
Any configuration with an electronic switch will consume battery when off. An indicator or auxiliary LED will add to this. You can turn the LED off in the Anduril configuration if you want and it will reduce the parasitic drain, but not remove it completely. The only way to have absolutely no drain is to unscrew the battery tube a few revolutions. Not just until the button LED goes off, but more, to completely sever the connection of the batteries to the light.

Rayoui
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The cells are in parallel so they will naturally self balance. No special considerations are required for balancing while charging.

The switch LED uses very little current (don’t remember exact numbers; it’s been mentioned before). It would take years to drain fully charged cells. If it’s a concern, it can be turned off.

GMozz
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I recall a calculation that the switch led would take 16yrs to drain the battery when set to low.

Now if you haven’t used the lantern in 16yrs…. well then the parasitic drain from the switch led is hardly the main concern.

CR888
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When I first got my LT1 I unboxed it, tested it playing around for a night then put it away & didn’t use it for a few months. Now I use it every night. Run it without cells off a 30,000nAh Romoss power bank and attach lantern to a light weight collapsible stand.
http://imgur.com/a/uEa9wyR
Looking forward to the mini when its done.

CR888

justanotherguy
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What this CL1 lantern ive seen on facebook?

MtnDon
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justanotherguy wrote:
What this CL1 lantern ive seen on facebook?

?link?

sarge12
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pol77 wrote:
The way the batteries are connected in parallel, there is no way to do any balancing, so definitely no.
Any configuration with an electronic switch will consume battery when off. An indicator or auxiliary LED will add to this. You can turn the LED off in the Anduril configuration if you want and it will reduce the parasitic drain, but not remove it completely. The only way to have absolutely no drain is to unscrew the battery tube a few revolutions. Not just until the button LED goes off, but more, to completely sever the connection of the batteries to the light.

Excuse me….with all cells in parallel, there is no way for them to not be balanced. 4 cells put into a carrier where all 4 positives touch the same conductor, and also terminate to the same ground will immediately start balancing. The higher potential cells will start charging those of lower potential until all 4 have equal potential.
JoeRodge
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Is it supposed to look like this on the board? I hate to come off as rude but it just looks sloppy. Maybe it is normal?

Also, what is the adjustable component with a Philips head for?

Fescron
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JoeRodge wrote:
Is it supposed to look like this on the board? I hate to come off as rude but it just looks sloppy. Maybe it is normal?

Also, what is the adjustable component with a Philips head for?

The thing on the board is flux residue, it’s from the reflow soldering process and helps the solder flow well by enabling a better heat transfer and it also removes some corrosion from the copper and such. It’s no problem it’s still there but it does indeed look a bit dirty.

I’m pretty sure the adjustable component (potentiometer), in combination with the solder bridge on the left of it, can be used to increase/decrease the glow of the button.

JoeRodge
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I didn’t mean the flux. The outer ring is missing some material. Also why put solder on half of the “B” stuff like that.

Fescron
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JoeRodge wrote:
I didn’t mean the flux. The outer ring is missing some material. Also why put solder on half of the “B” stuff like that.

Hmm, I’m pretty sure the solder on the B is excess that came from under the ring… They must have applied a little bit too much solder paste or something. About the ring I don’t really get what you mean unfortunately…

JoeRodge
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On the bottom right if the picture the layer what looks like gold. It looks like it a piece was scraped off. It was like that when I got it.

The solder thing makes sense, thanks. I feel like that could of been a safety hazard. Glad it didn’t short anything.

flightless22
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Sofirn has a small batch of LT1 with Anduril 2 and powerbank function

https://sofirnlight.com/products/new-version-blf-lt1-lantern-with-anduri...

Coscar
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flightless22 wrote:
Sofirn has a small batch of LT1 with Anduril 2 and powerbank function

https://sofirnlight.com/products/new-version-blf-lt1-lantern-with-anduri...

No Green option? Beer Beer

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


A little John Prine

madcrow
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Does anyone know if the extra spare parts (additional o-rings, button cap, USB connector cap) are included in the normal (“without-battery”) option? Or only with the “with-battery” option?

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My first one was ordered w/o cells and came with the spares you asked about. That was from the first batch but I don’t see any reason that would change as other lights I have purchased w/o cells have included the spares as well.

whitecitadel
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Does anyone know when sofirn might restock the colours?

Anyone tried the new board with power out?

madcrow
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Quote:
Anyone tried the new board with power out?

I will, sooner or later Smile Ordered one last Friday.
BTW, I also asked Sofirn some technical questions prior to making the purchase. Which they answered quite promptly:
  1. Is it possible to use the power-bank function while the lantern is lit? >> yes
  2. Is it possible to charge the lantern, while it is lit? >> yes
  3. Is it possible to operate the lantern directly from an external (Type-C) power source, while no batteries are installed? >> yes
  4. Is maximum brightness (maximum LED-driving current) achievable in any of the above scenarios? >> yes

If those replies are accurate, it is pretty damn impressive. (Although I admit, I am not sure how I should interpret the answer of “yes” to the 4th question: “yes, in all of them” vs. “yes, in some of them” Big Smile ) I guess I’ll have to wait and see.

goshdogit
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Amazon has some Prime Day deals on the LT1 in green, brown, and orange.

Price is about $66 with batteries, before tax.

These appear to be the ‘older’ models that don’t have the power bank function.

madcrow
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Do I remember correctly that flat top NCR18650GAs are also suitable for this lantern (i.e. it is not necessary to go for its less common and more expensive button-top counterpart)?
(Because the flat NCR18650GAs also have a slight “bump” at their positive contact.)
Do you know of any reliable sellers with reasonable prices in the EU? Unfortunately NKON.nl don’t seem to have either variant in stock now Sad

pol77
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Has anyone asked Sofirn if they are willing to provide the new driver board, with power bank function, for someone who already has the LT1, to replace the old one?

Rexlion
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goshdogit wrote:
Amazon has some Prime Day deals on the LT1 in green, brown, and orange.

Price is about $66 with batteries, before tax.

These appear to be the ‘older’ models that don’t have the power bank function.


Yeah, but Sofirn has been offering to email a coupon code to BLFers for an even better price, $62.24 including batteries, for most of this month. linky

== We save the planet from darkness ==

goshdogit
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Rexlion wrote:
Yeah, but Sofirn has been offering to email a coupon code to BLFers for an even better price, $62.24 including batteries, for most of this month.
You’re right, thanks for posting. Thumbs Up

Looks like they’re offering an Amazon code that brings the price down to $61.03 with batteries, more info in this thread.

It sounds like they will also honor the price for the new colors, according to their recent replies in that thread.

Perception
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goshdogit wrote:
Rexlion wrote:
Yeah, but Sofirn has been offering to email a coupon code to BLFers for an even better price, $62.24 including batteries, for most of this month.
You’re right, thanks for posting. Thumbs Up

Looks like they’re offering an Amazon code that brings the price down to $61.03 with batteries, more info in this thread.

It sounds like they will also honor the price for the new colors, according to their recent replies in that thread.

They sent me a code for an orange one.

whitecitadel
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madcrow wrote:
Do I remember correctly that flat top NCR18650GAs are also suitable for this lantern (

You need button top, or the battery fouls components on the driver board as I recall, details are in the thread already if you use thread search (I know what you mean about the NCR bump but I think it would still catch)

Coscar
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goshdogit wrote:
Amazon has some Prime Day deals on the LT1 in green, brown, and orange.

Price is about $66 with batteries, before tax.

These appear to be the ‘older’ models that don’t have the power bank function.

Can anyone verify if these have the power bank feature?

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


A little John Prine

SIGShooter
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whitecitadel wrote:
madcrow wrote:
Do I remember correctly that flat top NCR18650GAs are also suitable for this lantern (

You need button top, or the battery fouls components on the driver board as I recall, details are in the thread already if you use thread search (I know what you mean about the NCR bump but I think it would still catch)


I can use flat top batteries (Panny 18650B’s, 30Q’s, and various laptop pulls) in my 3 LT’s (part of the original buy) without any issues. It probably comes down to manufacturing tolerances on the LT’s.
SammysHP
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SIGShooter wrote:
It probably comes down to manufacturing tolerances on the LT’s.

Not really. It depends on the height of the positive terminal above the wrapper.

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