pgt400
1 kW
I see Jack R has a prebuilt 28S3P pack coming in from China. Did anyone see in his video he had a nice little clamp with a terminal post? Would make it very easy to assemble P packs.
pgt400 said:I see Jack R has a prebuilt 28S3P pack coming in from China. Did anyone see in his video he had a nice little clamp with a terminal post? Would make it very easy to assemble P packs.
Great find Doc!Doctorbass said:Price :283.3$ for 7S3P
A fantastic opportunity to ask this supplier what is "their definition" of B-Grade. Is it A123's definition too?The Mighty Volt said:I just got an email from a Chinese supplier offering me B Grade A123. Thats the first time a supplier has every expressly and explicitly referred to the product as B-Grade and offered it accordingly.
Ypedal said:Just because a statement cannot be proven false, does not make it true.
miro13car said:Thread suppose to be about Victpower cells
You see don't dare to write about anything else HA HA
miro13car said:But seriously ,those 7S 3P packs are so tempting to check them out
I agree with both of you too. I was only offering what I learned so far only offering pure speculation & opinion & wishful thinking & also going by Doctorbass' posts of test results of finding no defective cells out of 180 cells!The Mighty Volt said:Ypedal said:Just because a statement cannot be proven false, does not make it true.
Agreed.
The truth of the matter is that nobody knows what the story is. Not yet.
We are in the dark. Or in the grey. :lol: What we are relying on is tests. Thats why I ordered my own CBA III so I can start to order, test, and post results.
Its up to everyone to try to get a cell and test it and post their results. Then we can cross-reference and come up with some accurate conclusions.
Not definite conclusions. Just accurate ones.
This entire A123 thing is so typical of the United States- brilliant academic and engineering minds, zero business integrity.
Just to follow-up further with what your interesting speculation is (see above) I found out from a news release what was the cause of the defect:bigmoose said:BTW, this is opinion, my opinion... I think these modules hitting the grey market shows the desperate financial state of A123. First they dumped loose cells, now they are dumping the modules. All off shore and in China, so (again IMHO) they are free of all legal obligations to ensure these are only sold to "qualified" individuals by US law.
I also think there is some mix of quality in the cells. If I had to guess I would think the cells sold months ago with cut tabs might be the poorest. They were dumped first (perhaps) and neutered by a company that was more healthy. Then they dumped production stockpiles that were aging. These cells may not have had all the QA done on them. So they may have undetected problems. Now I would bet that cells that made it into modules are darn good cells.
This probably means, IMO, imo, that there will be a small percentage of these cells we are getting that WILL HAVE this defect. Using the NASA test =or= whatever Doctorbass suggests we do for each cell, then we should be able to weed these out. I'm getting greedy now!"The cause of the defects described today was faulty calibration of one of four welding machines in the Michigan plant that caused misalignment of a component in some cells, Vieau (he is the President of AONE) said today. The flaw could cause an electrical short, which could result in premature failure of the battery or decrease performance and reduce battery life, he said."
Hi Doc, I know you bought some Nano LiPo a year+ or more ago from Hobby King.Doctorbass said:Here is what i think:
These cells was tested and tested and tested.. They are probably one of the most tested LifePo4 cells by independent tester, RC user and company … the Chevy Volt builder also have choosed them. Well.. the LiFePo4 nano chemistry that A123 developed is the lifepo4 best chemistry ever made.
Doc
Thanks for the information.agniusm said:I was looking at the photos of the module. My thinking is that it has Korean cells in it. Note on the module test sticker: date 25.04.2011, tests passed, POS MBB, w/LOB but not NEG MBB and w/LOB of that. Don't know what that means. Now i assume that cells in the module will be marked as A2, cells i have with A2 marking all delivered around 19.3-19.8AH. Bad cells i have received were Korean marking. They all were at 0.00 volts, dead. I have to check serial number of the and that is represented i guess by PSD?V?O. I cant make out other numbers and i cant read the qr code ether. Room for thoughts
Cheers
There is whole thread on the issue. This is why i post this, the cells were from same victpower(Read here: http://endless-sphere.com/forums/viewtopic.php?f=14&t=33939)deVries said:Thanks for the information.agniusm said:I was looking at the photos of the module. My thinking is that it has Korean cells in it. Note on the module test sticker: date 25.04.2011, tests passed, POS MBB, w/LOB but not NEG MBB and w/LOB of that. Don't know what that means. Now i assume that cells in the module will be marked as A2, cells i have with A2 marking all delivered around 19.3-19.8AH. Bad cells i have received were Korean marking. They all were at 0.00 volts, dead. I have to check serial number of the and that is represented i guess by PSD?V?O. I cant make out other numbers and i cant read the qr code ether. Room for thoughts
Cheers
What company did you buy the Dead Cells from?
Were the Dead Cells sold in a module of many cells or sold individually & sent as a single cell?
Did you get an exchange warranty for Dead Cells for DOA?
I wonder which A123 customer is assembling e-vehicles in Korea?
(The defective cells were all made in the USA.)
Thanks! "Agniusm" 8)
deVries said:Hi Doc, I know you bought some Nano LiPo a year+ or more ago from Hobby King.Doctorbass said:Here is what i think:
These cells was tested and tested and tested.. They are probably one of the most tested LifePo4 cells by independent tester, RC user and company … the Chevy Volt builder also have choosed them. Well.. the LiFePo4 nano chemistry that A123 developed is the lifepo4 best chemistry ever made.
Doc
How would you compare that HK LiPo nano chemistry to A123?
Also, what about the manufacture process of the cells? Is the manufacture or packaging of the A123 cells better than the way the Hobby King Nano LiPo is packaged or manufactured in your opinion. You have tested and used both chemistry types for more than a year now...
Your opinions from testing & experience are good enough information for me... after all, you have tested sooo many different cells & batteries & chemistry types that I think you offer an informed opinion, at least. 8)
Thank you! Sir Battman!
davec said:1c results from Mavi
so we have it- the vict cells sag under 3volts at 15-16AH based on Doc bass chart- and the legitimate mavi cells are down to 3volts at 18ah
19.79ah down to 2volt LVC
vict cells do not meet the specs- zoppa hit the nail on the head - their cells are truly 16ah- the shortcomings are obvious- why are they not meeting the full specs? used/recycled/manufacture defects? no idea.
hence the reason we are getting them so cheap.
case closed.