EMC scooter batteries

Hi ckas,
ive owned 2 emaxs (the scooters emc have).
The silicon batteries are rather stiff voltage wise, ( will maintain 12.6v at 3.5C or 70A) when fully charged. Also their capacity and voltage sag doesnt get as bad at cold temperature. This is of course all compared at agms. havent been able to test them at higher C rates. they claim to be capable at 30C, i want to test this shortly. If the Hawker enersys batteries are anything to go by im execting maximum power point at 7v@600A.

bad points: QC on those batteries arent the best, theyre cheap knock offs of greensavers. so service life can vary a bit.

replacements are supposed to be cheap though ($40 a battery 12v20AH). I dont know from personal experience however, i changed to lithium as soon as the set the scooter came with failed. The other scooter was crashed.

regards,
Matt

Hi,
Do you have a URL with the specs for the batteries? They might just suit my 3 phase application. I found the China site http://www.greensaver.cn/en/Product/ProductDetail.aspx?ProductID=6 but its a bit thin on the detail.

Can they be charged with a normal lead acid automatic charger?

Cheers,
Mal.

Hi Armin,

I have a lithium taste and a lead acid budget unfortunately.

But by all means, send me the details including BMS and special charging needs. m.faed /at/ ieee.org

I need to make up a 600v pack. I am looking for 14+kWh.

See my blog for the build details. The oldest post has an overview.

Were you at the meeting on Tuesday night? I was there and enjoyed seeing the conversion.

Regards,
Mal.

Hi Mal,

No I haven't been to any of the previous AEVA meetings but I since I am now a major supplier of LiFePO4 batteries in Australia I will come along to future meetings wherever possible.
I sent you some photos and information to your hotmail address. Let me know if you received the info there or if you want me to forwrd to your other address.
I just received the first demonstration battery pack and cells two days ago (finally after a 4 month wait). At least they are here now and the factory is in full production.
We sent off our first batteries to the US yesterday for the Saturn Sky which is being built by Amp Motor Works.
More information on the EV is here-
http://www.evworld.com/article.cfm?storyid=1271
I received the first two samples of our brand new 12Ah LiFePO4 high energy cells. These are so new that the two cells I was sent are numbered 10 and 11 off the production line on the manufacturing ID barcodes.
One cell I will keep for myself to show customers and the other I will be sending in the next couple of days to Ian at zeva so he can provide his expert opinion and do some tests on it if he wishes.
Anyway I will keep in touch and let you know what happens.

Cheers,
Armin

I suspect that "Silicon" batteries are just Sealed Lead Acid in disguise. Companies come up with all sorts of marketing strategies to get away from having to say "Lead".

Mal, do post up your test results when ready.
A low peukert hopefully comes with an increased cycle life. This would make lead acid even more tempting for the budget concious.

Please consider and describe your charging profile.
FYI Have a look at....

http://www.commutercars.com/downloads/batteryCharging/chargeAlgorithm.pdf

Edited by acmotor - 19 May 2008 at 7:22pm