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Probably rubbish ...but worth a punt?
Should be good enough for a Feather.
http://www.dealextreme.com/details.dx/sku.5105http://www.dealextreme.com/details.dx/sku.5105
A quick Google around gives a probable continious discharge rate of 15C.
BUY 10 or more ...go to checkout click BULKRATE and the price drops to $34.69 including shipping!
I think i will need to get my money back from robotmarketplace. My A123-cell packs arrived and after removing the shrinkfoil, it seems they solered all the vent holes from the cells. Tomorrow i will put a picture online. :sad:
They dont supply what they promise on there website:
These packs are constructed with highest-quality triple-welded tabs, wiring strain-releif, and 3M Polyolefin Mil-Spec rubberized finish.
There are no triple- welded tabs used and only wiring strain relieve for 1 cable. I would advice not to buy it.
(Message edited by tough_as_nails on September 15, 2008)
Note that the blue dot on the button (negative) end of the cell is not actually a vent - apparently it is where they are filled. And there is no vent on the flat (positive) end either. So shouldnt be a problem where they are soldered.
If you can have a look at the individual cell voltages when discharging and check that they are all similar capacity and that you can get at leat 2 Ah out of them, then I would suggest they are OK.
Would be good to see a pic.
Just out of interest, could you post a picture of the cells please?
Looking at their site, im not too sure they are actually A123 cells. Which ones did you get? the spec on their site says the higher capacity cells are only 20A discharge, 30A max. And they state the 1100mA cells as being A123s, but im pretty sure they only make 1 size.
Nope 3 are listed.
http://www.a123systems.com/#/products/http://www.a123systems.com/#/products/
They dont actually make the 32 series. And doesnt look like they will be either, unfortunately. Just the 18650 and the 26650 - 18 mm or 26mm diameter, both 65 mm long.
Started making up the packs for beta
http://www.b-e-t-a.com/2008/images/a123-6s4p.jpghttp://www.b-e-t-a.com/2008/images/a123-6s4p.jpg
looks good john. Do you glue the cells together or just rely on the tape you use to hold it together? Also what is so special about the tape you seem to use? heat resistant? Im making my own packs sometime next week, you still upfor checking them when there assembled? Im getting the same cells you just ordered via Grant..
Hopefully this link works:
http://picasaweb.google.com/Jeroenvdlo/Firestarter1#http://picasaweb.google.com/Jeroenvdlo/Firestarter1#
These cells are glued with hotglue it seems.
Dave, no havent bothered gluing them together. Theyre only card tubes, so wouldnt make a great deal of difference.
Yup, Kapton tape is good stuff - you can attack it with a soldering iron and it doesnt melt. Great for building packs, particularly for keeping the balance wires separate from the main connectors.
See http://www.terrorhurtz.com/a123/build.aspxhttp://www.terrorhurtz.com/a123/build.aspx