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  #101  
Old 07-25-2012, 08:56 AM
ruckus ruckus is offline
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Default Re: Balqon/Winston/Thundersky batteries at <$1/AH

The se40ah and se60ah cells are rated for 10C.

The new CE series cells are supposedly good for 12C, but the pdf link at the CALB website doesn't work for me.

http://en.calb.cn/Product/?id-116.html
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  #102  
Old 07-31-2012, 07:47 AM
MN Driver MN Driver is offline
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Default Re: Balqon/Winston/Thundersky batteries at <$1/AH

I've been paying attention to what the sites for Thudersky(from when they were ThunderSky), Winston, Sky Energy, CALB, Sinopoly and HiPower have been saying.

ThunderSky never had a time frame on their short term 10C discharge but always said 3C constant discharge. ..this was when their 1C discharge chart showed plenty voltage sag to where under 3C they only got to about 40% SOC before dropping below 2.5v.

Winston current specs below, same thing for every cell, see what I say about Sinopoly below. The C ratings should be different for different cell sizes as the voltage sag is different but Winston battery charts are questionable because they take the exact data and put it on every cell size.
http://en.winston-battery.com/index....ategory_id=182

Sky Energy and CALB have showed specsheets showing 10 second short term discharge at 400 amps for 40Ah cells, 600 amps for 60Ah cells, 700 amps for 70Ah cells, 800 amps for 100Ah, and 1000 amps for everything over 100Ah. I have yet to see a CA specsheet that was updated recently and this one is old but can be obtained if you can handle Chinese the way I can and track down the PDF file on their site, which it seems nobody else has. I haven't posted it to this forum because it seems outdated based on what's in it and that it hasn't been changed in the past 2 years or so but here you go.
http://www.calb.cn/UpLoadFiles/product.pdf

Sinopoly says 5C all around for everything from their 40Ah
http://www.sinopolybattery.com/Clien...3261108482.pdf
to their 1000Ah cells
http://www.sinopolybattery.com/Clien...7251417142.pdf
This doesn't make much sense to me and I think their 40Ah is probably just as capable of 10C and discussed their 20Ah cells via email with Sinopoly and they said they could be 200amps discharge with no problem for 15 seconds but hadn't shown the test results anywhere.
There was a document here showing voltage sag of 5C discharge from Sinopoly 100Ah cells and I think they could easily do more than 5C for a short period without overheating. This is just my opinion though and I understand why they might be cautious when creating specsheets.

HiPower their cells used to be geared towards lighter weight which they had some of the lightest cells you could put into a car but their discharge rates used to be the lowest amongst the prismatic that we could get here. They have since redesigned their cells and they seem to be much better at 3C continuous and 5C 60 seconds and 8C for 15 seconds.
http://www.hipowergroup.com/uploadfi...5123901167.pdf
Wayne Alexander of ev-blue.com has been putting them into cars(recently saw a Saturn conversion in Wisconsin and spoke with the owner) so he must have a distributer and it might be worth asking him where he gets them.

I hope this helps, please keep in mind I haven't tested all of these cells and am merely commenting on data from specsheets and from the information that I know of people who actually have used these cells.

For Winston, ThunderSky, and CALB data there are charts from Jack Rickard showing the whole discharge. Simon showed incredible performance of 1976amps at only 2.74v sag from new 180Ah CA series cells. As far as Winston goes, I'm very curious to see something from Jack Rickard's 400Ah cells but I have a feeling I might not see any data from them unless he does a dynamometer test on the Escalade, which seeing as he has done the rest of his vehicles, I'm interested in seeing that too.

Voltage sag shows a direct correlation of the internal heating inside the cell, the less voltage sag, the less total internal heat created in a cell. IMHO if you can keep your LiFePO4 above 2.5v on a 10 second discharge you are in good shape for those 10 seconds. Obviously you don't want to be discharging a high rate from your cells and then pull down to 2.5v for 10 seconds because heat is cumulative and takes time to dissipate. If you are under 50C consistently measured directly at the cell terminals, I think you are in good shape for long cell life, again IMHO.
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  #103  
Old 07-31-2012, 11:43 AM
Semper Vivus Semper Vivus is offline
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Default Re: Balqon/Winston/Thundersky batteries at <$1/AH

The datasheets for the CA series are available on the Calb website now.
Datasheets say 2C max. for the CA
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  #104  
Old 07-31-2012, 03:37 PM
somanywelps somanywelps is offline
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Default Re: Balqon/Winston/Thundersky batteries at <$1/AH

Maybe they meant 20.

Whatever it is, it's better than the blue cells.
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  #105  
Old 09-20-2012, 09:37 AM
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Talking Re: Balqon/Winston/Thundersky batteries at <$1/AH

Quote:
Originally Posted by ruckus View Post
The se40ah and se60ah cells are rated for 10C.

The new CE series cells are supposedly good for 12C, but the pdf link at the CALB website doesn't work for me.

http://en.calb.cn/Product/?id-116.html
They have the pdf files compress into a rar file, you probably need something like Unarchiver to open up that rar file.

Keep in mind that Jack Rickard said that the latest booklet from CALB was complete nonsense.

Nucleus
(now in sunny Puerto rico)
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  #106  
Old 10-03-2012, 10:07 PM
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Default Re: Balqon/Winston/Thundersky batteries at <$1/AH

I am ready for another 36 cells to double my pack amperate to 180 Ahr. Two weeks ago I went to the Balqon website and the 90Ahr cells were out of stock with a two week lead time. I waited about 10 days and called Steve, the guy who handled my last transaction and he said they would be getting some more cells in stock in the next few days. He gave me a proposal at $85 per cell for 38 90Ahr cells (I wanted a couple of spares). I will pick them up tomorrow, since I live 20 minutes away from their warehouse in Harbor City, California.

Incidentally they were a no show at the Alt EV show in Sta Monica last week and their website still shows two week lead time for the 90 Ahr cells. They don't project a consumer friendly face but it works for me.
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  #107  
Old 10-03-2012, 10:36 PM
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Default Re: Balqon/Winston/Thundersky batteries at <$1/AH

wow, still under a buck/ah..... screaming deal. we'll count on you to check in and make sure the doors are open. I happen to LIKE the 90ah-100ah size as it is a perfect fit for the 'average' daily use less than 50 miles with a good 144v or 156v set in a small vehicle.
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  #108  
Old 10-04-2012, 03:17 AM
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Default Re: Balqon/Winston/Thundersky batteries at <$1/AH

OK, I will post when I pick them up.
On the website the header description shows two week lead time but the product page shows 34 available.
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  #109  
Old 10-04-2012, 06:53 AM
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Default Re: Balqon/Winston/Thundersky batteries at <$1/AH

I bought 40 of the 90ah cells back in June. I did not get them out of the crates till a few weeks ago. While I was putting them in place I found one that was slightly swollen. The voltage was the same as all the others.

I e-mailed Steven At Balqon and described it. He ask for pictures. That
was on a Friday. Monday they picked up the old one,and the following Monday I had the new one.

They have very good customer service.

Alvin
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  #110  
Old 10-06-2012, 11:34 PM
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Quote:
Originally Posted by ricklearned View Post
OK, I will post when I pick them up.
On the website the header description shows two week lead time but the product page shows 34 available.
I am a little late on my followup post . I picked up my batteries and the the guys in shipping remembered me. There were some of the tractor trucks there that they are converting from lead to Lithium. Ar that moment, Steve came by and introduced himself. He is in charge of production and is only filling in on sales while his coworker is on maternity leave. Steve explained that the early generation of electric tractor trailer trucks were only getting two hours per charge on lead acid batteries. He said that recent tests at a local company indicated that the Lithium conversions were getting in excess of 16 hours/day. That is a big difference. I looked at some of the 1000Ahr batteries that they are putting in those trucks.
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