Cheap 35Ah cells 10c

[Lightfeet]

I came across a cheap pouch cell that Victpower is selling: NEC 72215265 35ah 3.7v 10c, 288mm x 218mm x 7.5mm , 800g, US 13.82$/piece, It would be good for a motorcycle application I wonder if it's good quality?

 

[999zip999]

buy one and get back to us. Good luck. You might need more then luck. Typo ? No link.

 

[Lightfeet]

I came across a cheap pouch cell that Victpower is selling: NEC 72215265 35ah 3.7v 10c, 288mm x 218mm x 7.5mm , 800g, US 13.82$/piece, It would be good for a motorcycle application I wonder if it's good quality?

 

[ARod1993]

I came across a cheap pouch cell that Victpower is selling: NEC 72215265 35ah 3.7v 10c, 288mm x 218mm x 7.5mm , 800g, US 13.82$/piece, It would be good for a motorcycle application I wonder if it's good quality?

That's an insanely low price ($0.106/wh, something like a third the cost of 20C Hobbyking LiCo). I found the link to the VictPower AliBaba site here; did you actually get a quote from them at that price or is that just based on the generic FOB pricing they're listing on the site? If you did, and you have some spare cash, grab 10 of them, a Cycle Analyst, and one of those enormous wire-wound power resistors. Put them in a 10S pack and drain them a few times at different C rates (0.5C, 1C, 2C, 5C, 10C, 15C); see how much capacity you can get out of them and how hard they sag at those voltages, and then let us know how close they run to rated capacity. If they turn out to hold 30-35Ah at 10C with minimal sag for a few cycles, then make a 14-16s or 21-24s pack, throw it in a bike with a Cromotor, and beat the shit out of it for a few hundred cycles. If they last longer than Hobbyking LiPo then I'd happily buy 50 of them to make a 6kWh pack for a light motorcycle, and a whole lot of other people on here would love to be able to get 48V 30-35Ah for $200 or so.

 

[Lightfeet]

Yes it's a quoted price from Victpower:Mirror Lee mail: cherry.yang@victpower.cn (She is replacing Cherry Yang)
It sounds too good to be true, and I'm tempted to buy some. I had already bought some used Zero batteries for a project when I came across these so I don't think i'll go for it, I was just throwing it out there for someone to take advantage of it.

 

[liveforphysics]

When MFG's have defective pouch cells, they slice the tabs off before giving them to the recycling company.

Victpower seems to once again have tapped a recycling waste stream, cut into the pouch tab exit area to gain access to the cut-off stub of tab, and then welded there own tab extensions on.

 

[ARod1993]

When MFG's have defective pouch cells, they slice the tabs off before giving them to the recycling company.

Victpower seems to once again have tapped a recycling waste stream, cut into the pouch tab exit area to gain access to the cut-off stub of tab, and then welded there own tab extensions on.

That explains a lot; those prices are cheaper than crappy SLAs, but if you're acquiring them at bottom-of-the-Chinese-barrel prices you can still make money. Just out of curiosity, the last time Victpower did this were the cells any good?

 

[liveforphysics]

When MFG's have defective pouch cells, they slice the tabs off before giving them to the recycling company.

Victpower seems to once again have tapped a recycling waste stream, cut into the pouch tab exit area to gain access to the cut-off stub of tab, and then welded there own tab extensions on.

That explains a lot; those prices are cheaper than crappy SLAs, but if you're acquiring them at bottom-of-the-Chinese-barrel prices you can still make money. Just out of curiosity, the last time Victpower did this were the cells any good?

We know the previous batch they had was from the recalled defectively manufactured Fiskar Karma battery modules A123 shipped to China for recycling, then went bankrupt and never paid the recyclers, so they sold the cells to resellers instead of recycling them. This included tons of batteries that had sat for extended periods at <2V that they simply charged up and shipped to customers.

Personally, that's not a supplier I would want to support, and I wouldn't use the cells if they were free, but everyone has different goals and objectives and expectations.

 

[ARod1993]

When MFG's have defective pouch cells, they slice the tabs off before giving them to the recycling company.

Victpower seems to once again have tapped a recycling waste stream, cut into the pouch tab exit area to gain access to the cut-off stub of tab, and then welded there own tab extensions on.

That explains a lot; those prices are cheaper than crappy SLAs, but if you're acquiring them at bottom-of-the-Chinese-barrel prices you can still make money. Just out of curiosity, the last time Victpower did this were the cells any good?

We know the previous batch they had was from the recalled defectively manufactured Fiskar Karma battery modules A123 shipped to China for recycling, then went bankrupt and never paid the recyclers, so they sold the cells to resellers instead of recycling them. This included tons of batteries that had sat for extended periods at <2V that they simply charged up and shipped to customers.

Personally, that's not a supplier I would want to support, and I wouldn't use the cells if they were free, but everyone has different goals and objectives and expectations.

Ah. Those aren't sales practices I approve of either; Hobbyking may be shady and have substandard quality control but at least they're predictably shady.

 

[999zip999]

Very shady.

 

[johnrobholmes]

I got lucky with my shipment from victpower, all full tabs and not a dud in the 48 cells I kept! Unless you consider 18ah from a 20ah cells duds like a123 did.

 

[Hillhater]

It wasnt just the capacity or the short tabs on those A123 cells.
They were "QC" rejects because of the known potential for internal failures and the practical impossibility of identifying the good from the bad !
Some other buyers have already reported the very early failure of those cells.
Who knows what story is behind these 35Ahr cells ? .. VP certainly are not going to tell us for sure.
These guys have as much concern for their customers as a crack dealer has. !

 

[Lightfeet]

I got lucky with my shipment from victpower, all full tabs and not a dud in the 48 cells I kept! Unless you consider 18ah from a 20ah cells duds like a123 did.

John, Are you talking about the 35Ah cells? did you purchased some? How are they working for you?

 

[zzoing2]

There are some from 13 usd fro, here too:
http://www.alibaba.com/showroom/3.7v-35ah-high-capacity-li--polymer-battery.html

Run one of them through some stress tests! see how fast it blows up


is that 8kg for a 37v 35ah battery?

I still have a defective up victpower 48v 20ah pack, it got ill when i charged it up near freezing temperatures in 2010 ignorantly, it looks like an accordeon with puffed up cells. next to it i have a defunct anna/ping battery which is still square.

sounds suspiciously cheap, but damn convenient. Are there other 35ah prismatic cells around from other manufacturers?

 

[zzoing2]

There is actually a victpowerBadBattery.blog and very many forum posts that say avoid victpower, where you search for them

http://victpowerbadbattery.blogspot.fr/