Help choosing 21700 battery for my Sofirn C8F

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vs19
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Help choosing 21700 battery for my Sofirn C8F

Hi everyone,

I’m new to the game and get a bit overwhelmed by the level of technicality needed to make useful choice.
I just order from Sofirn on Aliexpress the C8F kit.It includes the lamp, a charger and a 21700 battery.
It’s a Sofirn 21700 Battery 4000mah Rechargeable li-ion Battery 40A 3.7V.

I trust them to deliver a decent battery for their flashlight but I saw better?, bigger? battery such as :

– Samsung 48G 21700 4800mAh 4.8A – Samsung 50E 21700 5000mAh 9.8A – LG M50 21700 5000mAh 7.27A others ?

But can’t figure out which one is suitable for the flashlight, I plan to use their charger,any input on that ?

Any help and some insight will be really appreciated.
Thanks for reading,
Vincent

hiuintahs
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I also recently purchased a C8F and wanted a spare battery. I went with the Samsung 50E. I was looking at post #36 in this thread:
http://budgetlightforum.com/node/62876?page=1

All three of those batteries make good choices in my opinion but the Samsung 30T and Sofirn battery will give a little higher output current due to lower battery resistance. That’s really only a concern if wanting to use the max output for any length of time.

For me I wanted a little more capacity and will only use the max output on occasion so I don’t care if I have slightly diminished output. (I probably won’t notice the difference anyhow).

Also the charger that Sofirn provides works but I wanted something better. My choice was the Miboxer C4 Upgrade. The Miboxer C2-4000 would fit a 21700 also.

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wstrachan
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the 50E battery might struggle a little in the Amperage category running on high for extended periods. I run the Sofirn 4000 mAh battery with great results! I am awaiting delivery of the Vapecell 4500 mAh cell which I have high hopes for. 20A continuous discharge w/4500 mAh for a bargain is quite good.

light addict....yeah I've got the bug.

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Delta_V
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Do we know which cell Sofirn is using in their batteries?

As far as spare cells, the Samsung 40T might be the best all-around. It will easily handle the current demands of the C8F, while having 33% more runtime than a 30T. The 5000 mAh cells might work, but they might be getting into the upper ranges of their current ratings.

wstrachan
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The Sofirn cell is likely a 40T but thats not confirmed. They can be had for around $10 a pair through Sofirn.

light addict....yeah I've got the bug.

Atrolux MF02_O2S
Imalent DT70
Emissar (All Models)
Lumintop ODL20C
Wuben A21 & T70
thrunite tn32 ut
acebeam k60
many, many others...

BlueSwordM
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It’s not a Samsung 30T.

It’s Lishen 4000mAh 15A.

My very own high current Beryllium Copper springs: http://budgetlightforum.com/node/64047
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

Lightbringer
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Yeah, I just bought the kits and use the come-with cells. They work just fine. No complaints.

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teacher
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Lightbringer wrote:
Yeah, I just bought the kits and use the come-with cells. They work just fine. No complaints.
I got the kit too & am pleased with the Sofirn also.

Using the Samsung 50E you’ll get a bit more run time but a little less output on Turbo.

Using the Samsung 30T you’ll get a bit less run time but a little more output on Turbo.

The Sofirn battery, as Lightbringer said….. “works just fine”. Thumbs Up

Delta_V mentioned the Samsung 40T, I don’t have one of those; but as he said….it would be a good one. On par with the Samsung 30T, but 33% more runtime.

You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant 

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Lightbringer
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Wellp, I don’t quite understand the obsession with getting, say, 2700lm instead of 2500lm, when even side-by-side few if any people would be able to positively ascertain which one is brighter.

I’d go more for runtime (absolutely quantifiable) vs a nigh-invisible improvement in brightness.

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Oh, and I got a 4pak of Sofirn 21700s from the recent sale, so I’m “invested”. LOL

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teacher
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Yeah, same here Lightbringer…. I’m more into longer run time myself. Wink

You never know how a horse will pull until you hook him up to a heavy load./"Bear" Bryant 

 .................................. "Slow is Smooth, Smooth is Fast" ...................................

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teacher
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Lightbringer wrote:
Oh, and I got a 4pak of Sofirn 21700s from the recent sale, so I’m “invested”. LOL
How much was that “4pak” on sale Lightbringer??
Sorry I missed that…… Facepalm

You never know how a horse will pull until you hook him up to a heavy load./"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  

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vs19
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Thanks all of you for your advices, especially hiuintahs, your post is very useful.
I think I’ll stick with Sofirm for the battery and will look for a good charger.

hiuintahs
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Hey that’s great. I think the Samsung 40T is also a good fit. If I could easily find another Sofirn 4000mAh battery, I’d go with that too. A 50E battery should be arriving soon and will have a chance to check that out.

I ended up buying the Miboxer C4 Upgrade charger. I thought it was a good value. I posted a picture of the Sofirn 21700 in it here:
http://budgetlightforum.com/node/62140 (post #22)

RobertB
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teacher wrote:
Lightbringer wrote:
Oh, and I got a 4pak of Sofirn 21700s from the recent sale, so I’m “invested”. LOL
How much was that “4pak” on sale Lightbringer?? Sorry I missed that…… Facepalm

I have 4 of the Sofirn 21700’s I’ll sell you. $4 bucks each plus what ever 1st Class mail is. I bought them for the Fireflies E07 that pulls 20A, and they just don’t work as well as the 30T does. Brightness is a noticeable difference. But for lower drain, they are an excellent cell.

teacher
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Lightbringer wrote:
Apparently <16bux on 11-11. Hang on…

Ah, here ya go…

http://budgetlightforum.com/node/63517

http://budgetlightforum.com/comment/1409840#comment-1409840

Thanks Lightbringer, sorry for my late reply; looks like some kinda ‘deal’ is still going on. I picked up 4 for just under $16. Shocked
Again, appreciate the info & links. Thumbs Up

Sofirn 21700

RobertB wrote:
teacher wrote:
Lightbringer wrote:
Oh, and I got a 4pak of Sofirn 21700s from the recent sale, so I’m “invested”. LOL
How much was that “4pak” on sale Lightbringer??
Sorry I missed that…… Facepalm
I have 4 of the Sofirn 21700’s I’ll sell you. $4 bucks each plus what ever 1st Class mail is. I bought them for the Fireflies E07 that pulls 20A, and they just don’t work as well as the 30T does. Brightness is a noticeable difference. But for lower drain, they are an excellent cell.
Thanks RobertB, but I ordered THESE last night after LB sene those links.
Getting em’ from you would have saved the ‘China Connection’ shipping wait though. Wink Again, thanks anyway for the offer…. Thumbs Up

You never know how a horse will pull until you hook him up to a heavy load./"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  

      Xlamp size chart _ BatteryU _ Flashaholic? Need Professional Help???            TheOriginal _ TAB _ LightSearch _ BatterySearch _ 14500's _ DiCal 

 

                                             

teacher
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Oh yeah, if anyone is looking for a good, but inexpensive; charger for their 21700 batteries. Here is a Xtar 2A single bay I can vouch for.

.

And if you need a good USB Wall Adapter, here you go….

You never know how a horse will pull until you hook him up to a heavy load./"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  

      Xlamp size chart _ BatteryU _ Flashaholic? Need Professional Help???            TheOriginal _ TAB _ LightSearch _ BatterySearch _ 14500's _ DiCal 

 

                                             

Brainsick67
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BlueSwordM wrote:
It’s not a Samsung 30T.

It’s Lishen 4000mAh 15A.


How do you know? Ive asked Sofirn but they said irs not a Samsung 40T, the cell they say is 40Amps wich i dont believe.
hiuintahs
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teacher wrote:
Lightbringer wrote:
Yeah, I just bought the kits and use the come-with cells. They work just fine. No complaints.
I got the kit too & am pleased with the Sofirn also.

Using the Samsung 50E you’ll get a bit more run time but a little less output on Turbo.

Using the Samsung 30T you’ll get a bit less run time but a little more output on Turbo.

The Sofirn battery, as Lightbringer said….. “works just fine”. Thumbs Up

Delta_V mentioned the Samsung 40T, I don’t have one of those; but as he said….it would be a good one. On par with the Samsung 30T, but 33% more runtime.


I got me a Samsung 50E in the mail today. I charged it up along with topping off the Sofirn battery. I checked in my makeshift lightbox, the lux figure for each battery. Naturally, I expected to see a slightly lower reading with the 50E at the turbo level…………..which I did.

And I expected to see the same output at the lower levels regardless of what battery was installed………….but instead what I saw was a lower level with the 50E battery at all levels. At the low level (not the moon mode…..just level one), I’m getting 410 lux in my light box (about 7 lumens) with the 50E. And I’m getting 660 lux (about 11.8 lumens) with the Sofirn battery.

So I’m wondering why that is? Evidently this light is not current regulated? I guess I can be OK with it as long as I get proportionally longer run time with the 50E compared to the Sofirn battery.