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hi all
im looking into buying some a123 cells, from ebay x12
found some on ebay.co.uk for £55 with shipping from hong kong
http://cgi.ebay.co.uk/12-X-A123-2300-Li ... 7C294%3A50
has anyone bought cells from this seller does the price seem good etc?
also anyone that runs a123s what balancers do you use?
thanks alex
Yeah I bought recently from them. No problems at all and yes that is a bloody cheap price for them.
Just be aware, the cells come from Dewalt packs so you have to remove some tags and they weren't all sitting at the same voltage.
I currently don't bother balancing A123s. Haven't had a pack go out by much and if they do I find a real slow 10 hour charge sorts em out fine.
thanks Gary
so what tags did you use to construct your packs then?
cheers
Can I recommend just using some copper braid? It's easy to solder, handles current nicely, and is flexible so you don't have as much of a risk of a connection breaking under shock...
You could go for the copper braid option however I decided to use the battery bars from technobots as I was ordering several other parts at the same time.
I soldered my 8 cell pack together, put wiring on then covered all the cell ends with tape. I laid this onto a piece of foam which was then laid onto a plate of titanium longer than the pack. I heatshrunk some of the yellow 100mm stuff from technobots over the whole lot and attach using some holes in the titanium strip.
If you want a really good guide for soldering these cells then take a look at Johns page (cheers John! saved me a lot of hastle!)
http://www.terrorhurtz.com/a123/
does anyone have the dimensions of a a123 cell?
ignore post, was looking at wrong cells online.
I will be able to tell you in a few hours when i get back to edinburgh
See the spec sheet:
http://a123systems.textdriven.com/produ ... L_2009.pdf
Also the part number tells you - ANR26650M1 - 26 mm diameter, 65 mm long.
With the paper tube on them they are around 26.7 mm diamter.
and make sure you use a BIG soldering iron... it takes a lot of power to solder the base of the cell, because the case is aluminium.
If you are thinking of using bars, thse are the ones specially for A123s:
http://www.aircraft-world.com/shopexd.asp?id=5085