One for the battery-builder guys

tommie said:

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

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tommie said:

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)

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tommie said:

http://www.aliexpress.com/store/product/48V10-4Ah-480Wh-turbobike-DE-ONDERDELEN-VAN-EEN-OMBOUWSET/705369_2049629440.html

BTN China,

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

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• 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

dilkes said:

tommie said:

http://www.aliexpress.com/store/product/48V10-4Ah-480Wh-turbobike-DE-ONDERDELEN-VAN-EEN-OMBOUWSET/705369_2049629440.html

BTN China,

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

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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/batteries2012/Sanyo UR18650ZY 2600mAh (Red) UK.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

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tommie said:

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?

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• 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