Batteries, chargers, motors and components made in China

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Kneelb4ZOD   1 W

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Batteries, chargers, motors and components made in China

Post by Kneelb4ZOD » Jul 24 2017 5:25pm

I have some free time and I live in Southern China near a lot of battery assembly factories, electronics and component manufacturers. A while back a friend recommended this place as a good DIY community, and I figured with my connections and location I could offer my assistance to anyone looking to purchase something from a Chinese supplier, which is probably just about everyone at some point or another. Knocking on doors is possible as long as the supplier is nearby. I can probably beat the price for just about anything you see online. Just let me know and I'll see if I can help.

If you need anything else from a Chinese shop, I can also help you as a purchasing agent. Rule of thumb is whatever it costs me to get the item to you + 10%.
Last edited by Kneelb4ZOD on Jul 26 2017 5:54pm, edited 1 time in total.
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beast775   100 kW

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Re: Batteries, chargers, motors and components made in China

Post by beast775 » Jul 24 2017 6:51pm

I'LL bite. 24v 25ah.
2 FINGER SALUTE TO ESSO.no buying gasoline for 14 years now.
I spent all my money on bicycles women and beer the rest i just wasted.

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Kneelb4ZOD   1 W

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Re: Batteries, chargers, motors and components made in China

Post by Kneelb4ZOD » Jul 26 2017 9:47am

beast775 wrote:I'LL bite. 24v 25ah.
If you only need one battery, a typical bike battery would probably cost me about 80-90 USD to pick up a 24v/25ah 600Wh battery, maybe 65 dollars for 20ah. The rest would depend on how you want it shipped. For one battery though, DHL et al. can get pretty rapey with their prices so it probably makes more sense to go retail. The big savings are when you have enough to ship by cargo.

If you wanted to build your own battery pack with 18650's and are willing to buy a decent amount, I can beat anybody's price on Endless-Sphere for sure - although the margin is a bit slim for branded cells. In fact, I may be willing to send a few free 18650 cells out to several members in the community in exchange for a detailed analysis and review. I might create a thread for that later.
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beast775   100 kW

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Re: Batteries, chargers, motors and components made in China

Post by beast775 » Jul 27 2017 3:45pm

Well lets see how much DHL will charge on a 24v 20ah with charger 2a.. i have a modded mp3 player with small diy amplifier and speakers that will eat 18650s if i play it loud,i have a good tester to hook up to it and get readings if your interested..
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Atdit   1 mW

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Re: Batteries, chargers, motors and components made in China

Post by Atdit » Jul 27 2017 5:17pm

Do you have very powerful DC-DC boost converters? 3-4kW?

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Kneelb4ZOD   1 W

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Re: Batteries, chargers, motors and components made in China

Post by Kneelb4ZOD » Jul 28 2017 9:34am

Atdit wrote:Do you have very powerful DC-DC boost converters? 3-4kW?
Check out Nenghua power, they have a bidirectional DC-DC converter with way too many features. They're a supplier for CASC (China's NASA) and have a huge range of adjustability. Efficiency isn't great on the lower power models, but 4kw/5kw can get above 95% at optimum voltages.

The 3kw model can go from just about 0-200v. Short bursts up to 6kw with short circuit at 60amps. Optimized for 48v on the low voltage side and 110 on the high voltage side. 50-40a max current low/high side. MODBUS-RTU protocol over RS485. Around 8 or so pounds with the case on. A pretty flexible bit of kit.

If you just wanted something non adjustable to step up from 12v-48v for example, I've also seen these around but I'd have to do some searching to find one above 2kw. If you just want to go from two specific voltages, you can also throw away the manual so to speak. The biggest downside with the Nenghua power is all the technical documentation and manuals would be in Chinese, so you would probably want to order some aspirin to go with it. Nenghua power is also really far away. I did find a supplier nearby, but I couldn't get in touch with him online. Maybe I can give them a call if you're interested. On a side note, those little DC-DC converters like those sold by sunkee cost like 50 cents to manufacture. lol.
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Re: Batteries, chargers, motors and components made in China

Post by ToMiCcc » Jul 28 2017 10:44am

1-2kw dc-dc boost converter module would be cool to have! Those cheaper modules that can be found on ali and ebay and can go up to 120v output are good and they cost only 20$ but the problem is that you cant realy push them to the limits . So to say 800w module is getting realy hot above 300-400w so its riski to push it...

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Kneelb4ZOD   1 W

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Re: Batteries, chargers, motors and components made in China

Post by Kneelb4ZOD » Jul 28 2017 12:04pm

beast775 wrote:Well lets see how much DHL will charge on a 24v 20ah with charger 2a.. i have a modded mp3 player with small diy amplifier and speakers that will eat 18650s if i play it loud,i have a good tester to hook up to it and get readings if your interested..
I usually send stuff out through a logistics company, saves me a lot of headache and they can usually negotiate better prices with carriers. Should be fine sending it to CA, although you guys do have some of the most restrictive airmail policies regarding batteries so I need to double check this. A lot of people have stopped sending this kind of battery to Canada due to restrictions. I'll get a better idea of the cost and options tomorrow when everyone wakes up. I'm a night owl.

Edit: Just want to be clear, I don't want to get ahead of myself. I'll want to double/triple check to make sure I can send this kind of battery by airmail to Canada given the number of people who won't do it. I won't feel comfortable taking a risk with an 65~80 dollar battery that size if I can't get some kind of guarantee it will make it to the land of maple syrup.

One thing to note is it is just about the lowest price/watt hour assembled battery pack you can find, so you're going to get the most use out of it at lower amperage. It's basically the same as those selling for $300 dollars (25Ah pack) on Aliexpress in terms of performance.

I did a quick search to see what people were saying who actually used batteries from this supplier. No bad product reviews that I could find. One guy said his power connector got crushed, but blamed the courier. People seem to be saying they get the most range out of it at 250 watts. A couple reported they typically got 80-100km range with assisted pedaling. One reported getting up to 97km range on a Giant XTC800 (Using their 540wH pack). Another guy wrote that he took it 25km just on electric power, and another 25 with assistance for 50km on one charge. Another guy on their 540wH pack said he got 20km on less than half power.

If you did want to try it out, assuming we can get it in your hands with restrictions what they are, I'd be really curious to see what kind of test results you get out of it. If it's best used below .5C that's kind of restrictive, but for a 250watt hub motor you can't touch it for the price assuming it holds up. This is basically as cheap as you get for a legit single battery. Cheapest new cells you can get on the Chinese market nowadays... you could almost get 60kWh of storage (same as a model 3) for 4,000 usd if you didn't care about energy density. Not that you would actually want to use those cells, but that is basically the limit at current material prices for what is possible in my opinion.

As far as 2A chargers, they are generally between 2-7 dollars. You usually get what you pay for in this area, better components/high price. I've had good experience with middle of the road chargers. 5 dollars seems fine to me.
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beast775   100 kW

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Re: Batteries, chargers, motors and components made in China

Post by beast775 » Jul 28 2017 1:59pm

Thanks for the feedback Kneelb4ZOD.. most builds i do have 12a- 22a controllers...easy as pie on batts :wink: .
2 FINGER SALUTE TO ESSO.no buying gasoline for 14 years now.
I spent all my money on bicycles women and beer the rest i just wasted.

steven7601   10 W

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Re: Batteries, chargers, motors and components made in China

Post by steven7601 » Jul 30 2017 6:55pm

What kind of deal can you get me on say 270 18650's preferably the 3500ah cells with 10amp ratings. Maybe Lg. Or pannisonic cells

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Inwo   10 kW

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Re: Batteries, chargers, motors and components made in China

Post by Inwo » Jul 30 2017 11:00pm

What can you find about this company or similar products?

https://www.aliexpress.com/item/lithium ... 84410.html

100 lot is only down to $18 plus shipping.


https://www.aliexpress.com/store/produc ... .13.fJkAzt

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Kneelb4ZOD   1 W

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Re: Batteries, chargers, motors and components made in China

Post by Kneelb4ZOD » Aug 07 2017 8:07pm

steven7601 wrote:What kind of deal can you get me on say 270 18650's preferably the 3500ah cells with 10amp ratings. Maybe Lg. Or pannisonic cells
For 3500mAh cells, there isn't a lot of competition out there, so the prices are all really high. There are no good Chinese cells at that density in my opinion, so you really have to go with brand name which have smaller margin. Most of the discount comes from buying from large suppliers closer to manufacturing.

If you need 3500mAh, your best choices are pretty restricted due to it being on the bleeding edge of li-ion energy density.
Prices are what I can get here give or take 5 cents or so.

-Samsung 18650-35E 10A/3.2C
$2.90/cell $783/270
-LG MJ1 3500mAh 10A/3C
$2.85/cell $770/270
-Sanyo 18650GA 3500mAh 10A/3C
$3.15/cell $850/270

If you could sacrifice a little on Density, there is a lot more competition and the price drops in a big way. There are also some decent Chinese batteries in the 2500mAh range
For example Changjiang 2400mah 10A/4C
$.93/cell $251/270

Sorry about the slow response. I've been super busy these days. If you guys have any more questions just leave a message and when I have more time I will try to go through them!
What can you find about this company or similar products?

https://www.aliexpress.com/item/lithium ... 84410.html

100 lot is only down to $18 plus shipping.


https://www.aliexpress.com/store/produc ... .13.fJkAzt
I'll do a bit of searching and see what turns up. There are similar options available in the neighborhood of 6 or so dollars, but I haven't seen anything exactly like that before. Cool stuff.



As far as shipping. It turns out that since April this year trying to ship by air to Canada is a bad idea. The logistics company I usually deal with only ships out 500kg+ by sea. However I've asked some of my friends who regularly ship these batteries out and I've found someone who can ship by sea. It just takes a long time. Would be great if we could ship a wide variety of cells to be tested by members of the community and then pick a few good ones and warehouse a bunch of them in Canada for Endless-Sphere members as it seems the price/options are so limited at the moment.
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Inwo   10 kW

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Re: Batteries, chargers, motors and components made in China

Post by Inwo » Aug 08 2017 6:39pm

I'm down for,100+ pieces depending on price.
Be glad to share buying power.
My quote now is $15 moq 500.

dirkdiggler   10 kW

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Re: Batteries, chargers, motors and components made in China

Post by dirkdiggler » Aug 09 2017 3:29pm

Can you order me a lightning bee from Sur-ron.com? I'd be down for that.

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Inwo   10 kW

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Re: Batteries, chargers, motors and components made in China

Post by Inwo » Aug 10 2017 8:32pm

Try this 16s balancer. Much lower cost.
https://www.alibaba.com/product-detail/ ... 62729.html

Need 5pcs each of the 4 configurations.

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zzoing   10 kW

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Re: Batteries, chargers, motors and components made in China

Post by zzoing » Aug 11 2017 3:42am

Inwo, There is a review of this on YT:
http://www.ebay.com/itm/18650-Li-ion-Li ... Sww9xZCaMI

https://www.youtube.com/watch?v=Be6X1fini-g

If you use some kind of automotive car light bulb for it isntead of a resistor, or you buy some NiChrome wire, wrap it on a tile and dip it in water, you could have some kind of precise dummy load for it. you need nichrome diameter so that 50cm is about 1.6 ohms to get 10w from a 10v battery, and it's easi to double up the wire for higher resistance.

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zzoing   10 kW

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Re: Batteries, chargers, motors and components made in China

Post by zzoing » Aug 11 2017 4:01am

Kneelb4ZOD, I can recommend some of the standard Chinese cell 18650 packs, with names nearly the same as Samsung cells (INR18650... copycats).

I got a pack advertised at 1000 watts, of fake cells which was 12.5 instead of 20Ah, and 200 cycles later it is still around 12.5Ah, It's still good. Only issue with it was the width of wires on the cells, they were all 1000W capable, except for a single Nickel strip joining the middle of the cell and at the terminal. i didn't notice and the hot zones: They got to about 140'C degrees on my first hill ascension!!! The shrink wrap developed a hole in it from one ride, so the cell is able to handle 100-200'C, and still hold perform normally afterwards.

I would prefer Brand cells at 2900Ah, which go for about 2.8 euros at the moment, a 26AH triangle pack... Although a heavier copycat cell 26AH pack would be interesting, because the cells are about 20cents a battery.

The black nylon triangle carrying bags can be good too. The zipper held some miles of mountains, although a scratch pad, to hold the battery, would be pretty good given that it gets hit quite a lot.

So quotes for 14s 21 - 26Ah packs of HQ and copycat cells plz.

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Re: Batteries, chargers, motors and components made in China

Post by Inwo » Aug 11 2017 10:06am

zzoing wrote:Inwo, There is a review of this on YT:
http://www.ebay.com/itm/18650-Li-ion-Li ... Sww9xZCaMI

https://www.youtube.com/watch?v=Be6X1fini-g

If you use some kind of automotive car light bulb for it isntead of a resistor, or you buy some NiChrome wire, wrap it on a tile and dip it in water, you could have some kind of precise dummy load for it. you need nichrome diameter so that 50cm is about 1.6 ohms to get 10w from a 10v battery, and it's easi to double up the wire for higher resistance.
What is this in reference to????

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Re: Batteries, chargers, motors and components made in China

Post by vex_zg » Aug 19 2017 6:43pm

I know there are quite a few issues now with shipping lithium cells. Would you be able to find shipping method to Europe, and how much would it cost? For example 150 18650GA cells?

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Re: Batteries, chargers, motors and components made in China

Post by davideserin » Aug 21 2017 10:01am

Hello, i'm looking for 66x 30Q and a 22s regen BMS with 60Amps continuous discharge.

I'm in London, UK

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Re: Batteries, chargers, motors and components made in China

Post by redline2097 » Aug 30 2017 4:56am

I would need 5x mid drives capable of 3000w continuous and 6000w peak. Shipped to Finland. Something similar than LMX Big block.

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