One for the battery-builder guys

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tommie   10 W

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One for the battery-builder guys

Post by tommie » Jan 07 2016 12:44pm

Been curious to know what cells are in my battery that came with the BBS02 kit.

I`m none the wiser as i didn`t want to start pulling it apart any more..

Can only read a part of the text on one of the cells -

RZY5D
91335

as you can see they`re a lightish red color - any ideas (its supposed to be 13ah/48v)
IMG_20160107_125552.jpg
IMG_20160107_125552.jpg (76.72 KiB) Viewed 1268 times

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wesnewell   100 GW

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Re: One for the battery-builder guys

Post by wesnewell » Jan 07 2016 2:56pm

Need Advice? https://endless-sphere.com/forums/viewt ... =3&t=66302
Mongoose 26" Ledge 2.1 mtb bike $99, yescomusa.com 48V 1000W rear hub kit $200, Hua Tong 72V 40A controller $35, 10ah 24s lipo $217=~43mph, range=45 miles @ 20mph. 25K miles and still going strong.
Huffy Fortress 3.0 with MXUS 3000 4T motor, 24s lipo, 96V 60A controller. Total cost with extras <$700. Top speed ~50mph
My videos https://www.youtube.com/channel/UC0KW4U ... _G2wQhptMg

tommie   10 W

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Re: One for the battery-builder guys

Post by tommie » Jan 07 2016 3:32pm

Thanks Wes,

so they`re Sanyo 2600MaH items,

maybe not the worst, but not up to the standard of the Samsungs or Panasonics you reckon?

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Sunder   100 MW

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Re: One for the battery-builder guys

Post by Sunder » Jan 07 2016 6:58pm

Hard to tell without a scale, but they look more like 26650s to me.

The way you can tell is that 18650s are 18mm in diameter (and 65mm long), and 26650s are 26mm in diameter.
eBike: Q100H on 16S with Phaserunner FOC Controller
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After 5 builds, the best advice I can give, is start with high quality products. I prefer http://www.ebikes.ca

tommie   10 W

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Re: One for the battery-builder guys

Post by tommie » Jan 07 2016 7:25pm

@ sunder,
yes should have measured the top when the case was apart, but i think they're 18650`s as there`s 52 of them in there and its only a water-bottle shark type battery.

Don`t think you`d get that many 26650s in there??

Just wondered if they were any good or no good!!

(bike frame size)
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Sunder   100 MW

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Re: One for the battery-builder guys

Post by Sunder » Jan 07 2016 7:54pm

tommie wrote: Don`t think you`d get that many 26650s in there??
Yeah, now that I can see how big the whole thing is, it's probably not 26650s.
eBike: Q100H on 16S with Phaserunner FOC Controller
eMotorscooter: Vectrix VX-1 on 36S
eCar: Mitsubishi Outlander PHEV... Waiting for warranty to expire
eHouse: 5.5kw On-grid solar with battery backup coming soon!

After 5 builds, the best advice I can give, is start with high quality products. I prefer http://www.ebikes.ca

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dogman dan   100 GW

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Re: One for the battery-builder guys

Post by dogman dan » Jan 08 2016 6:54am

Nice looking assembly for sure. Not like the cheapo pack spot welding.

dilkes   100 W

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Re: One for the battery-builder guys

Post by dilkes » Jan 08 2016 1:48pm

tommie wrote:Been curious to know what cells are in my battery that came with the BBS02 kit.

I`m none the wiser as i didn`t want to start pulling it apart any more..

Can only read a part of the text on one of the cells -

RZY5D
91335

as you can see they`re a lightish red color - any ideas (its supposed to be 13ah/48v)
IMG_20160107_125552.jpg
Tommie
Just wondering where you purchased that kit, specifically the battery? I have one as well and have been searching high and low for a battery mount exactly like that one so I can easily move the battery between two of my bikes. Maybe the vedor of that kit would be able to help me.

tommie   10 W

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Re: One for the battery-builder guys

Post by tommie » Jan 08 2016 2:12pm

http://www.aliexpress.com/store/product ... 29440.html

BTN China,

btw what`s the output of your battery, it was sold to me as a 13aH but i have my doubts.

dilkes   100 W

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Re: One for the battery-builder guys

Post by dilkes » Jan 08 2016 4:03pm

tommie wrote:http://www.aliexpress.com/store/product ... 29440.html

BTN China,

btw what`s the output of your battery, it was sold to me as a 13aH but i have my doubts.
Thanks for the reply with the link.

My battery in the same enclosure is a 13s4p config of Samsung 2.9Ah cells giving a total capacity of 11.6Ah. I tested it doing a controlled discharge at 15amps with a wattmeter inline and it did indeed dleiver around that number. However, they can put whatever flavor they choose of 18650 cells in that enclosure. My guess is that yours are Sanyo 2.6Ah cells as shown at http://lygte-info.dk/review/batteries20 ... %20UK.html.

The AliExpress link you pointed to says it is a 13s5p config and delivers 10.6Ah. Something is probably wrong here as:
  • I doubt you could fit 65 cells in there, although if you have it open you could count them.
  • If you could it would indeed be (5 x 2.6) = 13Ah
  • Most likely it is 13s4p config providing 10.6Ah

tommie   10 W

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Re: One for the battery-builder guys

Post by tommie » Jan 08 2016 4:39pm

dilkes wrote:
tommie wrote:http://www.aliexpress.com/store/product ... 29440.html

BTN China,

btw what`s the output of your battery, it was sold to me as a 13aH but i have my doubts.
Thanks for the reply with the link.

My battery in the same enclosure is a 13s4p config of Samsung 2.9Ah cells giving a total capacity of 11.6Ah. I tested it doing a controlled discharge at 15amps with a wattmeter inline and it did indeed dleiver around that number. However, they can put whatever flavor they choose of 18650 cells in that enclosure. My guess is that yours are Sanyo 2.6Ah cells as shown at http://lygte-info.dk/review/batteries20 ... %20UK.html.

The AliExpress link you pointed to says it is a 13s5p config and delivers 10.6Ah. Something is probably wrong here as:
  • I doubt you could fit 65 cells in there, although if you have it open you could count them.
  • If you could it would indeed be (5 x 2.6) = 13Ah
  • Most likely it is 13s4p config providing 10.6Ah
yes dilkes think you`re spot on there, i opened mine up and there`s 52 cells in there, no way could you get 65, typical sales pitch.
It`s pretty hilly where i am and i feel the BBS02 750W needs a lot more punch than 11aH, what do you reckon?

dilkes   100 W

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Re: One for the battery-builder guys

Post by dilkes » Jan 08 2016 5:18pm

tommie wrote: yes dilkes think you`re spot on there, i opened mine up and there`s 52 cells in there, no way could you get 65, typical sales pitch.
It`s pretty hilly where i am and i feel the BBS02 750W needs a lot more punch than 11aH, what do you reckon?
I am not an expert on this, but just to be clear:
  • The rated Ah represents the capacity of the pack/cells to deliver power between full charge and full discharge state
  • The Amps that the pack can deliver to the controller/motor is what is important when determining performance of the motor
  • The BMS is usually set to limit the current delivered to prevent damage to the cells
That AliExpress listing you pointed to says:
Continuous Discharge Current 10 A
10 min Discharge Current 15 A
5 sec Discharge Current 18 A

However, I would be somewhat sceptical of the quoted info they have there.

The 750W BBS02 running flat out runs at about 1000 watts and would want 20 amps at 50V.

Having said all this, my guess is your pack should be fine.

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DrkAngel   100 GW

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Re: One for the battery-builder guys

Post by DrkAngel » Jan 10 2016 11:19am

48V 13Ah pack has 13s4p indicating 3250mAh rated cells.
(If Sanyo 2600mAh cells then fictitiously rated.)
But ...
Most likely the new Panasonic-Sanyo NCR18650BF!
(Panasonic bought Sanyo)
3.7V 3250mAh nominal capacity.

Various spec sheets recommend .5C charge and 1C discharge with reasonable 2C discharge capability.

Life cycles is a modest 300 (to 80% capacity) @ minimal .5C Charge\Discharge rates
1C-2C, more typical rates, will greatly reduce usable life!
NCR18650BF.jpg
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wesnewell   100 GW

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Re: One for the battery-builder guys

Post by wesnewell » Jan 10 2016 3:40pm

Need Advice? https://endless-sphere.com/forums/viewt ... =3&t=66302
Mongoose 26" Ledge 2.1 mtb bike $99, yescomusa.com 48V 1000W rear hub kit $200, Hua Tong 72V 40A controller $35, 10ah 24s lipo $217=~43mph, range=45 miles @ 20mph. 25K miles and still going strong.
Huffy Fortress 3.0 with MXUS 3000 4T motor, 24s lipo, 96V 60A controller. Total cost with extras <$700. Top speed ~50mph
My videos https://www.youtube.com/channel/UC0KW4U ... _G2wQhptMg

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