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Old 18th February 2012, 01:45 AM   #41
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Originally Posted by BFNY View Post
I would not want to buy your device, or anything else you may design.
Jealousy will get you nowhere.
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Old 18th February 2012, 03:36 AM   #42
jc2 is offline jc2
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Originally Posted by dtproff View Post
TheShaman;

The MCP part doesn't appear to have a have a thermistor input for a temperature compensated CC/CV charge rate. It is also a linear part. Power dissipation in the IC could be an issue when charging a deeply discharged device.
I would want at the very least some sort of cutoff if the temperature of the cells gets too hot. Ideally you also want to lower the charge rate when temps are below 20C, and lower them further if you are below 10C. But you could get around it with a lower charge rate for all temps
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Old 18th February 2012, 01:49 PM   #43
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Thanks for the input guys, much appreciated.
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Old 22nd February 2012, 11:43 PM   #44
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Thank you gentlemen for your information and for having taken the trouble to post it.

I have just recently delved into this world of UltraFire 18650 batteries with eBay purchases that included really cheap junk chargers and without any real background information, this thread is a very timely reminder to do my homework.

It's back to the old NiMh units until I get all this charging business sorted out - this is no place for ignorance!
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Old 23rd February 2012, 12:38 AM   #45
agdr is offline agdr  United States
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If anyone has a US source for the Seiko chips, please PM. I tried to find a US source for this lithium balance charger chip

http://datasheet.sii-ic.com/en/batte...n/S8233A_E.pdf

a year ago with no luck.

Thanks...

Last edited by agdr; 23rd February 2012 at 12:46 AM.
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Old 23rd February 2012, 02:30 AM   #46
dtproff is offline dtproff  United States
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Seiko pretty much only sells to ODM's. I sugeest raiding digikey and see what other IC's are available. There is no magic in the Seiko Chip. There are others that work similarly.

Tony
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Old 24th February 2012, 03:12 PM   #47
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Quote:
Originally Posted by agdr
If anyone has a US source for the Seiko chips, please PM. I tried to find a US source for this lithium balance charger chip
Maybe this will help you!
Cheers, L
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Old 24th February 2012, 04:48 PM   #48
agdr is offline agdr  United States
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Originally Posted by Lorien View Post
Maybe this will help you!
Cheers, L
Thanks! I'll give that RFQ a try. They are even here in L.A. - maybe they will do will call.

Last edited by agdr; 24th February 2012 at 04:52 PM.
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