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Need help buying cylidrical LTO cells
#1
Hey everyone, I'm new here.  I'm building a small power pack and hope to share my project with everyone.  But right now I'm having trouble buying cells.

I specifically need cylindrical Lithium Titanate (LTO) cells, either 18650 or 26650.  The Yinlong ones are way too big for my project.

So far I scoured the Internet and I found only one company, Tiankang, that makes 18650 cells.  The PN is TK18650 NT35.

Does anyone have experience with Tiankang cells?  Or know where can I buy authentic new cells?

Are there any other 18650 or 26650 LTO cells out there, available in small quantities (<1000 pcs)? 

I see that KOK Power (KOK Battery) sells the Tiankang batteries for $2-$3 a cell (about $1/Wh).  Are they are a reliable supplier?

Thanks everyone for all your help, especially because I'm the new guy here.  Hopefully I can help others out in the future, once I get going.

Flint
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#2
lifepo4 is not a option?, cous i think it is not existing the way you want?
Most china is nice to play with and get your feet wet, in my opinion.
But serious play....sorry i am not convinced

With best regards,
Selling everything at marketplace.
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#3
(10-25-2019, 04:41 PM)100kwh-hunter Wrote: lifepo4 is not a option?, cous i think it is not existing the way you want?
Most china is nice to play with and get your feet wet, in my opinion.
But serious play....sorry i am not convinced

With best regards,

Thank you for the reply, 100kwh-hunter.

I need LTO for the low-temperature charging capability and for the high current delivery.  LiFePO4 would be my first choice otherwise.

Do you or anyone else have experience with KOK Power?  Are they a reputable reseller for selling batteries which are really new and authentic?

I can risk choosing a bad brand, and then having to change direction later, but I do need to know that the product I'm getting is new and authentic.  Otherwise if things don't work I won't know why.

Flint
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#4
Can you describe your project?
People might have some other suggestions.
Korishan likes this post
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#5
(10-26-2019, 04:44 AM)flint Wrote: I can risk choosing a bad brand, and then having to change direction later, but I do need to know that the product I'm getting is new and authentic.  
Yes sir, that's the issue with battery purchases.   Can only suggest you begin with small purchase(s) and establish trusted source(s).
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#6
(10-26-2019, 05:23 AM)Oz18650 Wrote: Can you describe your project?
People might have some other suggestions.

Agreed. It's kinda hard to make suggestions and/or ideas when the requirements are vague and the project is shrouded in mystery.

(10-26-2019, 04:44 AM)flint Wrote: I need LTO for the low-temperature charging capability and for the high current delivery. LiFePO4 would be my first choice otherwise.

Why LTO specifically? Other than temps and current. I don't understand why LiFePO4 wouldn't work just the same. How much current do you plan on dumping into these poor things?!?!?
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

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#7
Like offgrid was stating, you can get small batches, it is known to be good, but i also read stories that the second or third purchase was really bad.
It really hard to tell, maybe you are lucky, maybe not.

Oz18650 Wrote:
Can you describe your project?
People might have some other suggestions.

Korisahn wrote:
Agreed. It's kinda hard to make suggestions and/or ideas when the requirements are vague and the project is shrouded in mystery.

My question is similar ,sorry butt. We want to help you but we need more data.
Selling everything at marketplace.
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#8
If your considering (about $1/Wh) pricing level then this is quite expensive and guessing your looking for new LTO and not recycled ?

Commercial project ?
If you can't quantify how much they cost, it's a deal, I'll buy 5 of them for 3 lumps of rocking horse ......
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#9
(10-26-2019, 05:23 AM)Oz18650 Wrote: Can you describe your project?
People might have some other suggestions.

Hi Oz18650,

I am building a small power pack which can be recharged via solar and can power equipment in a remote wilderness location for a decade or more without maintenance.

My goal is to use enough cells that the power pack has extra capacity, and then if some cells fail they can be disabled and the equipment can run off of the remaining cells.  That is why high power output is important.  Less runtime is fine, but not having enough output watt capacity is not.  I need to be able to draw 5-10 C from the batteries.

The extra safety of LTO, not needing to worry about fires if the cells get damaged, is a big bonus too.  I like that LTO is pretty worry free, even in rugged wilderness environments.

Flint

OffGidInTheCity and 100kwh-hunter, thank you for the tips on establishing quality with a manufacturer or vendor by testing things out and then being careful. I wish there were established LTO cell manufacturers with distributors. I will take your advice and start out with a small order.

completelycharged, yes unfortunately I'm probably looking at new cells since I have not found any used LTO 18650/26650 cells on the market yet. This project is for a residential property, but if it works out maybe someone would find the project useful for commercial too (where the price probably isn't such a huge concern).

I wasn't expecting so many replies from you all. Wow, what a cool community. I'm excited to be here.

Flint
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#10
Will the pack be used in multiple locations? Ie how moveable does it need to be?
If it is being used for 10 years or more in one remote location, would a larger number of cells being used at lower currents work for you? Ie a more typical powerwall like most people here are building?
You mentioned low temperatures. Would a solar based heater work for temperature control for the cells - vacuum tube water heaters work in very low temperatures as long as there is sunlight on the tubes.
Just some ideas to consider.
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