Point1 or Life ?

[Ypedal]

http://myelectricbike.org/adaptron//batteries/Lithium/Iron/Phosphate/index.htm


Picture looks familiar.. and text is copy/paste from existing LiFe sites... anyone know bout this ?

 

[xyster]

I didn't see any pictures, but did notice the listed weight of 6kg sounds too light for LiFePO4, but just right for LiPo. Continuous discharge current is listed as 15 amps -- only 1C!

LiFePO4 Battery Packs

· Li-iron phosphate batteries: 36V/15AH (12pcs of 3.2V15Ah)

· Maximum discharging current: 35A

· Battery Management System Continuous discharging current: 15A

· Charger Output: 4ADC, 43.8VDC

· Dimension: 125*150*350mm

· Weight: 6Kg

 

[CGameProgrammer]

No, I don't think so. I know for A123s (which admittedly are a special LiFePO4), 12 cells weigh about 2.4 lbs, and 7 cells in parallel give 14.1 Ah, and so that would weigh 16.8 lbs. And 6 kg is 13.2 lbs. So it's very believable.

The low discharge rate is odd. I thought even cheap generic Chinese LiFePO4 (which these are, obviously) were still good for 5-10C.

 

[ChopperMan]

I didn't see any pictures, but did notice the listed weight of 6kg sounds too light for LiFePO4, but just right for LiPo. Continuous discharge current is listed as 15 amps -- only 1C!

My 2C 36V 20Ah pack (due to arrive in 3 days time) weighs 7.8kg so 6kg for 36V 15Ah could be OK but the 1C rating sucks. Thats of little use to anything but the most lightweight of ebikes.

 

[Ypedal]

hey chopperman, who is your battery comming from ?

 

[ChopperMan]

hey chopperman, who is your battery comming from ?

Hi Y, all the emails come from chinabatterycenter.com, they represent the manurfacturer Zhuhai Sanchuan Electronic Technology Co. I have spoken on the phone to the sales person a few times and all appears kosha.

They have sent me the results of the cell and charger testing results, together with photos of the process.

They do look very similar to the OC packs.

My farther in law is a retired electronics design engineer and he is building a test rig to cycle one of the packs. 2C discharge to 100%, wait 30 mins then 5Amp or 0.25C charge, wait 30 mins then repeat. That's the rough spec.

The other pack is going on my chopper for some real world testing, when it's finished

Cheers,

Ian

 

[Ypedal]

Do you know if it is comming with or without BMS ?

 

[ChopperMan]

Do you know if it is comming with or without BMS ?

Complete with BMS and charger. They have offerred a 3 year warranty on all equipment, cells, bms and charger. Probably not worth the paper it's written on. But you never know.

I will be test one pack to destruction...... the idea being that if the results prove positive, I will start importing.

 

[erdurbin]

That battery is from the http://www.goldenmotor.com
The website is Patrick's over at the goldenmotor forum.
They are not in production yet and he does not sell them. From what has been told on the forum, the pack is not ready yet for distribution.

 

[Battboy]

Please test for a 3 month cycle before you purchase these Chinese Packs.
There is a reason that I advise this.

Don

 

[oatnet]

Please test for a 3 month cycle before you purchase these Chinese Packs.
There is a reason that I advise this.

Don

This is a new "umbrella" statement from you on Chinese packs. Do you care to share the specific reason with us, or would you prefer to keep it vauge so that any problem can fall under it?

 

[Ypedal]

My question is how do i test something for 3 months without purchasing it !!!!! :lol: Someone fill me in on that PLEASE !!!!!! :wink:

 

[Battboy]

Please test for a 3 month cycle before you purchase these Chinese Packs.
There is a reason that I advise this.

Don

This is a new "umbrella" statement from you on Chinese packs. Do you care to share the specific reason with us, or would you prefer to keep it vauge so that any problem can fall under it?

Our Factory has tested a slew of packs they purchased from China and without mentioning specific brands, none of them passed a three month testing cycle. They start out fine but fail in under 3 months of continuous cycling of the packs.

Don

 

[oatnet]

Our Factory has tested a slew of packs they purchased from China and without mentioning specific brands, none of them passed a three month testing cycle. They start out fine but fail in under 3 months of continuous cycling of the packs.
Don

This is significant data on the long-term viability of Chinese Life that many people have been looking for, and it would firmly support your pricing structure for the Taiwanese LiFe, so please tell us more.

Can you document the details of some of these results so that we can clearly define the failings of Chinese LiFe? If it is an across-the-board problem, then the brand names are not significant, the results would be more than enough. Things that come to mind:

How many cycles were executed on assorted packs prior to failure?
Was the failure cells or BMS?
How is failure defined? <gradual to 80% capacity, or sudden/catastrophic (describe please)?
What charge/discharge loads were they tested under?
What were the capacity/configuration of the packs tested?
When did the 3 month testing period end?

-JD

 

[CGameProgrammer]

I myself experienced significant problems with an anonymous Chinese factory too, for regular lithium-polymer batteries; a supposedly 25 Ah battery was just 9 Ah! Though that was really a BMS flaw since pack voltage was still high. But I'm sure we all know for instance how those XM-2000 silicone batteries turned out. So there is good reason to test thoroughly before selling batteries from unknown companies.

 

[Battboy]

Our Factory has tested a slew of packs they purchased from China and without mentioning specific brands, none of them passed a three month testing cycle. They start out fine but fail in under 3 months of continuous cycling of the packs.
Don

This is significant data on the long-term viability of Chinese Life that many people have been looking for, and it would firmly support your pricing structure for the Taiwanese LiFe, so please tell us more.

Can you document the details of some of these results so that we can clearly define the failings of Chinese LiFe? If it is an across-the-board problem, then the brand names are not significant, the results would be more than enough. Things that come to mind:

How many cycles were executed on assorted packs prior to failure?
Was the failure cells or BMS?
How is failure defined? <gradual to 80% capacity, or sudden/catastrophic (describe please)?
What charge/discharge loads were they tested under?
What were the capacity/configuration of the packs tested?
When did the 3 month testing period end?

Be Glad to: Monsoons in Taiwan & Independence Day is over now so we will be talking to the factory tonight and I am requesting a more detailed report from their engineers on the tests they conducted. The 3 month test period just ended last week. Look for a meatier report to be posted here by Friday. 8)

Best,

Don Harmon

 

[vanilla ice]

Cool.

 

[oatnet]

Be Glad to: Monsoons in Taiwan & Independence Day is over now so we will be talking to the factory tonight and I am requesting a more detailed report from their engineers on the tests they conducted. The 3 month test period just ended last week. Look for a meatier report to be posted here by Friday. 8)
Best,
Don Harmon

Thanks Don, this will really help answer a lot of questions on cycle LiFe. (pun intended) Other than crappy electronics blowing a few cells, I haven't seen degradation of the packs I have been testing. However I am testing them by riding them, which is far fewer cycles than an automated charge/discharge can achieve. Assuming 2-3 charge/discharge cycles per day for 90 days, that is only 180-270 cycles.

-JD