21700 batteries that fit Convoy S21A flashlight

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passive101
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21700 batteries that fit Convoy S21A flashlight

Convoy’s website recommends thin 21700s that haven’t been re-labeled. Those are too big to fit in the flashlight. I’m looking for protected cells (I like to minimize complications and possible issues, but maybe today that isn’t a safety issue that concerns people anymore with modern cells?). What is a good reliable place to get LG, Samsung, Tesla, or Sony batteries? I found some sites that had Samsung ones, but they didn’t list specs. Are Nitecore’s thin or relabeled? I found one INR of theirs on a couple sites, but strangely it’s not listed on their website. I’m open to some suggestions on quality 21700 cells that don’t break my bank.

Also IMR/INR, vs regular Lithium cells? The flashlight is 6000ma at the brightest setting, but I’d like to be able to use the brightest option for as long as possible. Is their any downside to IMR’s vs regular lithiums? The only difference I can tell is standard lithiums have more energy storage.

Convoy description for the light
“I recommend LG ,samsung,tesla ,sony original 21700 battery, dont use vapcell,sofirn ,LISHEN etc. 21700 battery ,they replace the shrinkable tube of LG or samsung 21700, they are little thicker and not suitable. )”

Thanks for the assistance Thumbs Up

Edited by: passive101 on 06/03/2019 - 13:12
BlueSwordM
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Do you live in the US?

Don’t worry about chemistry too much and the like.

You need to look at the continuous discharge rating of a cell to see if the light can support it.

As an example, the Samsung 30Q has a continuous discharge rating of 15A, but is actually underrated.

If you want the cheapest 21700 cell that supports 12A discharge, I would recommend this one:
https://www.18650batterystore.com/21700-p/lishen-lr2170sa.htm

If you want a more powerful cell(30A), here it is:
https://www.illumn.com/21700-samsung-inr21700-40t-4000mah-high-discharge...

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

passive101
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Why are these only at 4000mah when others are at 5000mah?

I wouldn’t mind paying a little more for 1000mah more capacity to use at work.

BlueSwordM
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Because the 5000mAh cells are only rated to 10A max, while the Convoy M3 is rated at a max drain of 11A+.

You can order the 5Ah cells, but you will be limited on max mode in terms of runtime.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

passive101
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The description of the S21A says 6000ma at a peak brightness of 2300 lumens. I could be misunderstanding it though.

BlueSwordM
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Oh, you want the S21A, not the new Convoy M3. Facepalm

Get the Samsung 50Es then:
https://www.18650batterystore.com/21700-p/samsung-50e.htm

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

passive101
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BlueSwordM
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My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

passive101
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What is the primary difference between protected and unprotected cells?

Is their a safety benefit to protected cells still?

BlueSwordM
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Nah, especially since most of our lights already include the protections, the most important ones being reverse polarity protection and low voltage protection, which the S21A already includes.

So, no, there are no safety benefits, especially since you use quality light(S21A) and a high quality charger(Miboxer C4-12 Upgraded).

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

passive101
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That makes sense. Does LG or Samsung offer some options that are protected cells for comparison? I don’t mind paying a little more for peace of mind. I just need one that isn’t re labeled or has a very thin one to fit this light it looks like.

BlueSwordM
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LG or Samsung don’t offer protected cells of any kind.

And besides, protected cells won’t fit in the tubes anyway…

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

madsnake
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I use Samsung 40T in my S21A and it fits like a glove Smile Atm i have no interest in testing another one.

passive101
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Protected 21700s are not the same size?

I have protected 18650s that for my 18650 flashlights. They looked about the same size as my friend’s unprotected 18650s for his vape.

Satan@103TFS
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Pete7874
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passive101 wrote:
Protected 21700s are not the same size?

Protected cells are longer and slightly wider due to having to house an extra protection circuit and additional wrapping.
4492011
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BlueSwordM wrote:
Do you live in the US?

Don’t worry about chemistry too much and the like.

You need to look at the continuous discharge rating of a cell to see if the light can support it.

As an example, the Samsung 30Q has a continuous discharge rating of 15A, but is actually underrated.

If you want the cheapest 21700 cell that supports 12A discharge, I would recommend this one:
https://www.18650batterystore.com/21700-p/lishen-lr2170sa.htm

If you want a more powerful cell(30A), here it is:
https://www.illumn.com/21700-samsung-inr21700-40t-4000mah-high-discharge...


The Lishen will not fit.
4492011
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Satan@103TFS wrote:
I wonder if this Lii-40A https://www.aliexpress.com/store/product/2019-LiitoKala-Lii-40A-21700-40... fit Convoy 21700

Yes those will fit
passive101
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I think I would rather have cells close to 5000mah instead of 4000mah. Otherwise I’m not seeing a big difference from my 3800mah 18650 cells. Convoy offers the S2+ in 18650 in almost the same brightness of 1800 lumens with the same LED as the 21700 option.

Do all the lithium cells have less capacity the more output they have?

Pete7874
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passive101 wrote:
Otherwise I’m not seeing a big difference from my 3800mah 18650 cells.

There are no 3800 mAh 18650 cells.
BlueSwordM
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BTW, as of June 2019, there are no 18650s with capacities of over 3600mAh.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

passive101
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BlueSwordM wrote:
BTW, as of June 2019, there are no 18650s with capacities of over 3600mAh.

Oops my nitecore 18660 is 3400.

Dougiestyle
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Your nitecore 18650 has an exaggerated rating. Nitecore does not manufacture batteries.

will34
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I saw lots of mention of new 5,000mah 20A lishen and molicel 21700s in the convoy thread. I know they won’t fit the S21A but my zebralight sc700d can accept a 50E with triple wrapping, so they might fit perfect in there. Are those available for purchase yet?

d_t_a
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passive101 wrote:
Protected 21700s are not the same size?

I have protected 18650s that for my 18650 flashlights. They looked about the same size as my friend’s unprotected 18650s for his vape.

Protected 18650s and unprotected 18650s may have a difference of 3-4mm in length.

Protected 21700 and unprotected 21700 may have a difference of 5mm in length.

Most flashlights that accept 18650 will accept both protected and unprotected 18650s, but not all (eg. Emisar D4, Astrolux S42, etc. do NOT fit protected 18650s).

Protected 21700 are still very rare, I doubt flashlights that are not designed with those in mind will fit them, because the springs have to accommodate 5mm length (there will be a lot of current drop, for flashlights that use high-drain cells, having the extra length will mean a big current drop due to the size, as per my understanding)

justanotherguy
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I’m waiting for a different LED on the S21A

anyone in NE ILLinois into get togethers?

justanotherguy
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is there a 5000k 217000 convoy S21a yet?

anyone in NE ILLinois into get togethers?

California_Prepper
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What would be the best 21700 for the Convoy m21a? Much appreciated.

California_Prepper
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What would be the best 21700 for the Convoy m21a? Much appreciated.

BlueSwordM
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My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

California_Prepper
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BlueSwordM wrote:
The Samsung 50E: https://liionwholesale.com/pages/search-results-page?q=21700+50E

Thank you for the info and including the link. What makes this one the best?

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