60v/30Ah battery from Alibaba for $99?!?

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minime
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60v/30Ah battery from Alibaba for $99?!?

Post by minime » Mar 23, 2017 6:23 pm

60v/30Ah battery from Alibaba for $99?!? Is this a typo or a scam? https://www.alibaba.com/product-detail/ ... 0.0.kp51r8

slacker
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Re: 60v/30Ah battery from Alibaba for $99?!?

Post by slacker » Mar 23, 2017 6:53 pm

sorry if this offend's you but look around this forum and think about it. If it is to good to be true it probably is. Run away from this as fast as you can. Good luck and hope you find what you are looking for.

minime
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Re: 60v/30Ah battery from Alibaba for $99?!?

Post by minime » Mar 23, 2017 8:23 pm

slacker wrote:sorry if this offend's you but look around this forum and think about it. If it is to good to be true it probably is. Run away from this as fast as you can. Good luck and hope you find what you are looking for.
Look around this forum? There are thousands of threads; where should I look first?

There should be a sticky with "reasonable prices" for "medium quality" kits/batteries/etc so that people know what prices to expect to pay.

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Re: 60v/30Ah battery from Alibaba for $99?!?

Post by flat tire » Mar 23, 2017 8:53 pm

I'll help you out: that battery is shit and it won't deliver anywhere near the rated capacity even at 0.2c guaranteed.

Ebiking puts a moderate demand on 18650 cells even on a lightweight, low power kit. You need decent cells, and they don't come at the price that makes a pack of that capacity anywhere close to possible at $99 retail. Even if the company is losing as much money as Tesla they can't get the price that low!

http://www.best18650battery.com

Go there and look at the cells with at least 20 amp discharge capability. Then look up those cells on websites like imrbatteries.com (decent quantity pricing from a US supplier) where you can buy the batteries to see what the prices are. Then, you can have an idea of what a pack will cost if you pay someone a couple hundred bucks to put together a pack and ship it to you. That price may vary wildly depending on who is willing and able to make a pack at the moment you're in need.
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minime
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Re: 60v/30Ah battery from Alibaba for $99?!?

Post by minime » Mar 23, 2017 10:11 pm

flat tire wrote:I'll help you out: that battery is shit and it won't deliver anywhere near the rated capacity even at 0.2c guaranteed.

Ebiking puts a moderate demand on 18650 cells even on a lightweight, low power kit. You need decent cells, and they don't come at the price that makes a pack of that capacity anywhere close to possible at $99 retail. Even if the company is losing as much money as Tesla they can't get the price that low!

http://www.best18650battery.com

Go there and look at the cells with at least 20 amp discharge capability. Then look up those cells on websites like imrbatteries.com (decent quantity pricing from a US supplier) where you can buy the batteries to see what the prices are. Then, you can have an idea of what a pack will cost if you pay someone a couple hundred bucks to put together a pack and ship it to you. That price may vary wildly depending on who is willing and able to make a pack at the moment you're in need.
Great post. Very informative.

So if a cell is rated at 4.0V, then a 52V/21Ah battery should contain 52/4=13 cells? Or are there multiple sets of 13-cells pack that are interconnected in some way?

flat tire
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Re: 60v/30Ah battery from Alibaba for $99?!?

Post by flat tire » Mar 23, 2017 10:46 pm

That is a 16s battery, or 16 groups of cells in series. The nominal pack voltage, 60v, is derived from a voltage of 3.7v per cell for this chemistry and most e-bike battery chemistries besides lithium iron phosphate which I think is 3.2v nominal. The maximum voltage of the pack would be 67.2 volts or 4.2 volts per cell.

That's all academic; the pack you linked in the OP should in no way be considered.
Orange DH w/ Cyclone mid on 6kw
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Re: 60v/30Ah battery from Alibaba for $99?!?

Post by amberwolf » Mar 24, 2017 1:49 am

minime wrote:There should be a sticky with "reasonable prices" for "medium quality" kits/batteries/etc so that people know what prices to expect to pay.
That sort of thing doesn't work, because just about every new member that comes along has to create their *own* threads to ask about everything, and says that all the old threads are old and they want *new* info.

One reason there are so many threads is also because most new members prefer to create a bunch of separate threads about all sorts of things for their project instead of just starting a project thread and asking questions in it, or searching for / reading existing threads (at the least looking for ones with similar titles, if nothing else, often finds info they could have used).

So over the years it has made it much harder to find the info that is already there, and members that did try to organize things gave up since no one bothers to use it.

Similarly there are several sticky index threads and FAQs and such that most never bother to read, that contain lots of nice basic info that would help, rather than having other members have to retype it over and over in each new question thread.

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