If you are building packs today, which cells to choose?

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Re: If you are building packs today, which cells to choose?

Post by 999zip999 » May 10, 2017 8:30 pm

Oh 275.00 per 50 cells. Woops . I saw 275. I got real excited

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Re: If you are building packs today, which cells to choose?

Post by DVDRW » May 11, 2017 7:54 am

hemo wrote:Nkon.nl 2.50 euros a cell however you have to buy 540 cells to get that rate.
Bought 540, Sold leftover cells pretty quick at a higher price to vapers.

Good deal for US folks:
1,25$ 2250mah cells
https://www.youtube.com/watch?v=6uqpd6VYu_8

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Re: If you are building packs today, which cells to choose?

Post by rojitor » May 11, 2017 4:05 pm


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Re: If you are building packs today, which cells to choose?

Post by Ykick » May 11, 2017 4:09 pm

rojitor wrote:I will choose these!!!! http://www.ebay.es/itm/1-4X-18650-3-7V- ... SjmJvgwt-A
Lmfao :mrgreen:
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Re: If you are building packs today, which cells to choose?

Post by ccarse » May 15, 2017 10:39 am

DVDRW wrote:
hemo wrote:Nkon.nl 2.50 euros a cell however you have to buy 540 cells to get that rate.
Bought 540, Sold leftover cells pretty quick at a higher price to vapers.

Good deal for US folks:
1,25$ 2250mah cells
https://www.youtube.com/watch?v=6uqpd6VYu_8
How good of a deal is this? It seems really good?

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Re: If you are building packs today, which cells to choose?

Post by cal3thousand » May 15, 2017 5:50 pm

I think I would also include NCR18650b. Properly sized into 6P+ groupings, they will easily provide 40A continuous at 2C and be happy about it. If you keep these cells with 20% to 80% SOC, you can exceed 28,000 cycles.

There's many a good reason that Tesla uses them in the Model S. You just have to make sure you size the pack large enough that 2C will cover your Current requirements.
Get a Cycle Analyst and a Multimeter, you're still a noob if you don't have at least one of each.

Planning on posting questions or buying anything on this site? Put up your country (at minimum) on your profile. This is a worldwide forum and we haven't reached clairvoyance.

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Re: If you are building packs today, which cells to choose?

Post by spinningmagnets » May 15, 2017 6:26 pm

You just have to make sure you size the pack large enough that 2C will cover your Current requirements.
This is the core of the "cell selection" issue. Ebikes don't have room for a huge battery pack, so...battery pack components are a crucial selection process due to size limitations. I want more range, and at the same time I have started a protocol where I charge to only 4.1V per cell. I just ordered a much larger battery, even though the pack I have right now has nothing wrong with it...

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Re: If you are building packs today, which cells to choose?

Post by Hillhater » May 15, 2017 8:58 pm

cal3thousand wrote:I think I would also include NCR18650b.
......There's many a good reason that Tesla uses them in the Model S. .
...but Tesla does not use that cell ( and never has) in any of their packs .
This forum owes its existence to Justin of ebikes.ca

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Re: If you are building packs today, which cells to choose?

Post by Wheazel » May 16, 2017 5:20 am

cal3thousand wrote:I think I would also include NCR18650b. Properly sized into 6P+ groupings, they will easily provide 40A continuous at 2C and be happy about it. If you keep these cells with 20% to 80% SOC, you can exceed 28,000 cycles.

There's many a good reason that Tesla uses them in the Model S. You just have to make sure you size the pack large enough that 2C will cover your Current requirements.
This sounds like pure BS. The second statement about Tesla is as already pointed out not correct, but please provide some evidence for the first claim.
My guess is that the B cell will suffer from extended use at anything higher than 0,5C.

http://lygte-info.dk/review/batteries20 ... %20UK.html

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Re: If you are building packs today, which cells to choose?

Post by DVDRW » May 17, 2017 4:39 am

spinningmagnets wrote:
You just have to make sure you size the pack large enough that 2C will cover your Current requirements.
This is the core of the "cell selection" issue. Ebikes don't have room for a huge battery pack, so...battery pack components are a crucial selection process due to size limitations. I want more range, and at the same time I have started a protocol where I charge to only 4.1V per cell. I just ordered a much larger battery, even though the pack I have right now has nothing wrong with it...
My 18650PF (396Cells) 52Ah 80V triangle pack :twisted:
http://i.imgur.com/HrRfRmK.jpg
http://i.imgur.com/wIcIQme.jpg
Over a year now, still feels like brand new.
~150 Cycles
Charging 0.15C to 4.1V
Discharging 0.7C to 3.4V

If 12000 MAh cells were true then Model S would drive ~1700km with one charge!

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Re: If you are building packs today, which cells to choose?

Post by hypertoric_amplituhedron » May 18, 2017 10:12 pm

I recently got 500 ct. panasonic GA cells from batterybro.com. They're an american company based in Honk Kong. They were $3.91 per cell, at the time. Shipping to orlando was $210 air/ground in ~7 days. Payment processing was $65.

Also, there was a $68 COD from UPS (more like a ransom if you ask me. you better bet I'll cough up seventy more bucks in cash for those effing batteries, lol).

So, all in all, $2300.

We've tested about 5 random cells (1a and 2.5a so far) out of the 3 boxes. From 4.2 to 2.5v, they showed 3550 mAh. Also, they shipped at 3.5v.

If anyone has been considering them, batterybro is a great choice for grade A cells. My battery builder also has had a good experience with them.

Based on some email exchanges, I can tell you Michael Hogan (@ batterybro) is a good guy to deal with. Feel free to give him your business.

Very soon now, I'm getting a 24s12p built, or something in that range.
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Re: If you are building packs today, which cells to choose?

Post by PScott » May 19, 2017 8:44 pm

ccarse wrote:
DVDRW wrote:
hemo wrote:Nkon.nl 2.50 euros a cell however you have to buy 540 cells to get that rate.
Bought 540, Sold leftover cells pretty quick at a higher price to vapers.

Good deal for US folks:
1,25$ 2250mah cells
https://www.youtube.com/watch?v=6uqpd6VYu_8
How good of a deal is this? It seems really good?
Thats an amazing deal at 1.25 each. I bought 200 cells Comes with 10S BMS's too. These were pack 36V pack for the hoverboard that didnt work out. Manufactured in 2015 but still good cells.

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Re: If you are building packs today, which cells to choose?

Post by 999zip999 » May 19, 2017 10:06 pm

$4.60 per cell. Shipped. 288 cells for your pack.

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Re: If you are building packs today, which cells to choose?

Post by rojitor » May 20, 2017 5:09 am

https://eu.nkon.nl/rechargeable/18650-s ... 0-mg1.html
these cells have my attention. For 2.40-2.50 per cell looks a very nice option. Tumich has been selling 36v packs of Those.

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Re: If you are building packs today, which cells to choose?

Post by DVDRW » May 20, 2017 8:03 am

Got mg1 to cycle test this
https://youtu.be/PiNeL01VD0M?t=75

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Re: If you are building packs today, which cells to choose?

Post by 999zip999 » May 20, 2017 9:11 am

Tumich has a good deal but takes long time shipping from poland.

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Re: If you are building packs today, which cells to choose?

Post by rojitor » May 20, 2017 9:17 am

Very nice video dvdrw. Thanks for sharing.

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Re: If you are building packs today, which cells to choose?

Post by Simoc » May 24, 2017 7:26 am

Samsung 30Q 18650s are the best choice currently. Lipos are LI-ion batteries without the casing, hence lighter but prone to damage and puffing up.

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Re: If you are building packs today, which cells to choose?

Post by miro13car » May 24, 2017 8:45 am

have you consider pouch cells?
Like A123 20Ah or Nissan Leaf pouches?
I would never risk with Lithium Polymer

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Re: If you are building packs today, which cells to choose?

Post by 999zip999 » May 24, 2017 6:30 pm

Great cells for a scooter a little heavy for an ebike. Sorry was at the dentist. Hardto find a good dentist.

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Re: If you are building packs today, which cells to choose?

Post by DVDRW » May 24, 2017 11:05 pm

Simoc wrote:Samsung 30Q 18650s are the best choice currently. Lipos are LI-ion batteries without the casing, hence lighter but prone to damage and puffing up.
30% more expensive than 18650PF. Lipos are always heavier than 18650. Lipo Only benefit is higher current capability.

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Re: If you are building packs today, which cells to choose?

Post by Hillhater » May 24, 2017 11:46 pm

Choose the cells to suit the intended pack use, power demand, capacity, weight, etc
EG.. A 30 Ah pack for a ebike might use one type of cell, whilst a 10Ah (short commute) pack for the same bike might need a very different cell.
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Re: If you are building packs today, which cells to choose?

Post by tomjasz » May 25, 2017 2:30 am

Mj1 hg2 seem to have a consensus among a number of competent resellers.
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Re: If you are building packs today, which cells to choose?

Post by cwah » May 25, 2017 2:42 am

Yup. Pf has the best price
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Re: If you are building packs today, which cells to choose?

Post by Compoundbike » Jun 19, 2017 11:17 am

rojitor wrote:https://eu.nkon.nl/rechargeable/18650-s ... 0-mg1.html
these cells have my attention. For 2.40-2.50 per cell looks a very nice option. Tumich has been selling 36v packs of Those.
Just ordered 14 pieces to complete my 160 pcs. Pack. I hope that company is Legit.

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