Soshine 26650

[Dias]

Hello guys, since i haven't found much about these cells, I'd like to ask if you would recommend using them (would like to get them for my 48V/1000W rear drive by using 13s 3p):

http://www.soshine.com.cn/a652.aspx
http://www.dx.com/p/soshine-ncr-26650-5000mah-15a-3-7v-rechargeable-flat-top-batteries-blue-4pcs-408375#.Vst79rBumHt

The price is awesome and I can't use 18650 - I've 55mm wide closed frame and these should fit in nicely.

 

[stevc]

There is no feedback for this battery yet but have a look at the feedback for similar ones.

http://www.dx.com/p/ultrafire-26650-6000mah-3-7v-rechargeable-li-ion-battery-red-black-245407#.VsuvWpx97cs

 

[agniusm]

Why do you think it will fit? Its the same cell just wider. First two numbers are diameter in mm, second two is height, so 65mm for both.

 

[Wheazel]

The volume of these cells seem to be 2,08 times the volume of the common 18650. And probably slightly better still if the steel can is the same thickness and accounting for the increased shroud to useful mass ratio.
One would expect cells ranging from at least 5000mAh to 7000mAh by todays standards.
It also puts higher demands on the connections, nickel strips for example.

 

[Dias]

I've googled further and found some tests which seems legit: http://budgetlightforum.com/node/41699

They would fit in better cause 2x26mm=52mm and frame is 55mm. Using 18650 would mean 3x18=54 and that could be a problem. I am back to thinking about 18650 in triangular connections though: http://eu.nkon.nl/rechargeable/18650-size/panasonic-ncr18650b-made-in-japan.html they offer these for nice price with premade strips. That's a pro since I consider welding strips to batteries too risky while strip to strip should be much easier.

 

[agniusm]

You are thinking wrong. Read up these forums. NCR18650B is no good to you. You have to choose a cell to meet your demand. The Soshine is 0.2C cell, Panasonic NCR18650B is 0.2C cell and you need about 25A from the paralelled cells. Panasonic NCR18650PF would suit. Do the math first cause you will regret not to later.

 

[Punx0r]

Have you considered arranging 18650 cells in a tessellated pattern to reduce the width below 3x18mm?

 

[Hillhater]

In a 55 mm ID tube , you can get 7x 18650's in a "cluster"....but only 2 x 26650's !

 

[Dias]

You are thinking wrong. Read up these forums. NCR18650B is no good to you. You have to choose a cell to meet your demand. The Soshine is 0.2C cell, Panasonic NCR18650B is 0.2C cell and you need about 25A from the paralelled cells. Panasonic NCR18650PF would suit. Do the math first cause you will regret not to later.

Ah, I haven't looked into specs of them, I would just look and grab lower capacity - thanks for giving me a notice anyways and thanks for the tip about PF one. I will definetly get those.

Have you considered arranging 18650 cells in a tessellated pattern to reduce the width below 3x18mm?

I'm still trying to figure out a good pattern. With 18650 I will probably need 13S/5P. I have approx 25 cm * 5.5 cm * 20. Plenty of space but still need to make a good layout.

 

[Dias]

Hello again, searched the forum further and found out that Sanyo NCR18650GA with 3500mAh are pretty good too. Will have to use 13S/4P (Sanyo GA) or 6P (Panasonic PF) build - will decide later. The problem is placement of these cells cause I will have to put them in two "floors":

I could make "2 separate packs" and connect them together in parallel but I'm not sure if it's a good idea. Trying to figure out serial parallel connection but I fear that this kind of build where one battery is on top of the other would be fragile.

 

[Dias]

Any comments about this please? ..I've heard that combination of serial/parallel makes the pack more resistant to single cell failures. Could you guys approve this? Hope you understand what i mean