Lipo BMS

[Spacey]

It's pretty damn good and accurate enough not to worry about. Gives you all the cell voltages very cheaply and is configurable with an audible alarm.

[auraslip]

Epic post Spacey.

Evassemble should look at how much headway headquarters can charge for their packs to get an idea of how much money they could make if they had a good reputation.

Gary - what do you have the LVC set on your LVC boards and BMS?

[Emoto]

It's pretty damn good and accurate enough not to worry about. Gives you all the cell voltages very cheaply and is configurable with an audible alarm.

Sounds interesing,i like the idea of the percentage graph, i use a watt metre with same funcion for my rc models, good for a quick assesment,
But would like to hear from someone who has tested it with something accurate like a fluke... some hk comments said it wasn't accurate.

Plus if you look at the [japanese cellmetre 8], hk use it to test lipos before shipping , and say thats its accurate but its $89 it also balances.
I have this on the way http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9744 for my first build cheap looks like it will have some potencial

[EBJ]

Just wanted to point out that HK apparently isn't selling Celllog 8s's any more (at least they are not on their website at this time).
I did find them for 34 bucks each from:
http://epbuddy.com/index.php?main_page= ... ucts_id=14
I just ordered 2 of these Celllog 8S's and plan on hooking them up to sound an alarm and also cut the throttle input. I haven't figured out how to do that yet, but I imagine it is pretty simple to do. (will post up on that later)

Last thing I ordered from them (the parallel balance cables) showed up in the mail very quickly.

[eva-michael]

[quote="auraslip"]Epic post Spacey.

Evassemble should look at how much headway headquarters can charge for their packs to get an idea of how much money they could make if they had a good reputation.
quote]

Yes. Our prices are 25%-40% less after shipping in retail prices than local selllers.
Also outside package is in different level. No just a simple PVC.... We emphasize on Fireproof material only. No PVC. If we just use normal material and no case structure, we can have more room to bring down prices.

battery pack image.JPG (28.78 KiB) Viewed 539 times

[Spacey]

What is this....the Evassemble sale thread?

If you like shoddy crimped wiring that breaks under vibration or movement on the main feed wires....and yes that happened to two packs, if it wasn't for Beavernator complaining about the wiring I would not have checked. The main positive had frayed to about 5 strands of wire which had 40 amps peak going through it

The best bit though is the BMS sense wires, crimped? Nope....soldered? Nope........they were all twisted around a washer, just hand twisted and loose as well. I lost a cell due to the sense wire coming off and the cell going negative. The washer acts as a cutting edge when the screws are tightened......

Which leads me on to the screws on the actual cells, Michael you might want to go to the gym because a 3 year old girl could have undone some of the screws on the packs I bought from you, now add in a few miles of road vibration and you can see that the pack will fall apart and cause a nasty short circuit at some point, and Headways can pack a punch when short circuited.

Then there is the time it took me to totally dissemble the pack, solder on the sense wires to the bus bars, buy hex screws and decent washers to rebuild the pack....and thread lock for the hex screws.

So please show us all again how great and cheap your packs are, keep calling me out and try to make me look like I am moaning for nothing. I'm cool as I will not ever buy from you again butbthere are others new to this who will be enticed by your cheap prices.

You pays ya money...you takes ya choice.

[eva-michael]

Hello Spacey,
I can provide free battery pack to anyone who you can think it will be fair for a testing.
earlier, you said our BMS not good and Gorde make a threads about his installation of the BMS. This is very fair to let everyone know the result of the BMS testing.
viewtopic.php?f=10&t=28783&hilit=capacitor+bms

If right now, you also doubt about our battery pack. This time, We will provide it free to some one here for testing and post a thread here.
No matter which products you doubt about, I can provide products for testing as we dont want any misunderstanding from our clients over the world.
Forum moderator or some members with good experience will be recommanded.

[neptronix]

Well, i wouldn't mind one of your headway packs. I will even pay for shipping.
They look appealing, but due to your past reputation, i have historically told people to avoid ev-assemble because of bad experiences on the forum.

I would be willing to do a very detailed review ( as usual ). A 36v 10AH pack would be fine.

[eva-michael]

Well, i wouldn't mind one of your headway packs. I will even pay for shipping.
They look appealing, but due to your past reputation, i have historically told people to avoid ev-assemble because of bad experiences on the forum.

I would be willing to do a very detailed review ( as usual ). A 36v 10AH pack would be fine.

.

Hello, Thanks Nepetronix,
Let's work on it. I will arrange the EVA 36V 10Ah battery pack for free to you.
I just give you a PM message.
Please PM me back and leave me your delivery adress with telephone number and I will check the cheapest shipping for you. Via Fedex or UPS to you.
Thanks for your help Nepetronix. Please make a thread about the quality of our battery pack.
This will just make veryone here to feel more confident when they make a purchase.

[Spacey]

Cool, Neptronix will give it a fair appraisal. But I very much doubt it will of the same quality as the ones myself and others bought from you last year.

If you have improved them to a decent specification then great....that benefits everyone. But I only write about my own experiances as I am not alone with being not happy with your service. Crap tends to stick.

I hope. Ypur Liefpo4 chargers have all been tested and had the daughter boards inspected for the transistor that stops the bleeding voltage for the BMS?

[eva-michael]

[quote="Spacey"]Cool, Neptronix will give it a fair appraisal. But I very much doubt it will of the same quality as the ones myself and others bought from you last year.
quote]

No longer wanna keep a discussion with you. At that time, you even did not know how important a BMS in a battery pack will be. And intend to make batteries pack without BMS. That's why I ask you to send back several pcs of BMS and check your problem. This is very simple thing. I dont know how you can sell batteries pack at that time. Ok then stop.

If you just broke one pcs, we can pay for it even we dont know how the problem happened. Regarding a seller you are, we just want to clear out what happen in your case. Support and clear out your case is more important to you than to save dezens of USD to check the issue and clear it out. We are willing to spend more money to send testing battery pack sample. This is deserved as true is more important than a little of Money. Hope you can comprehend. There is another user who face connection issue in ES, we are sending him new bms for him as he only order one pcs and he is a user. We will follow up his case and just do what we can help him to make connection right as per connection instructions this time.

As a man, I wanna stop my mouth now and just do something. Let's do a testing.

Michael

[Spacey]

That's why I ask you to send back several pcs of BMS and check your problem

Michael you are beginning to really piss me off here with your muddying of the waters!

I simply....let's get this straight!!!....

I simply asked you 3 times 1...2....3.....3 emails pleading with you to check my wiring from the diagram I gave you.

You kept saying ... and these are your exact words...."This BMS is different" To which I kept replying "yes I know they are different but how? Please either send me correct wiring diagram or at least check my wiring to see if correct".

You NEVER DID!!!!!

Everywhere you pop up giving crap advice trying to get sales I will be there to give proper advice and advise on my experience with you. You are NOT to be trusted!

[auraslip]

Neither of you are gonna come out of this looking like good.

Spacey got screwed, and got his chance to log his complaint so it will be forever associated with evassemble on a google search. If the vendor wanted to defend himself, the time would of been when spacey originally complained. It's absolutely not worth it to get upset. People can and will decide who they think is the mature party.

Also, I think Neptronix is a great candidate. He really enjoys posting here, so he'll be sure to post all of his experience and hopefully pictures too.

[Spacey]

Sure it's a good idea as long as what is sent to Neptronix is of the same standard as all future packs. Can be dure it will be a lot higher quality than the ones I received.

Anyhow, as you say no one going to look good from arguing, I just don't like getting ripped off. I like to be treated as I treat others, there is a reason why I have over 800 feedbacks at 100% with Ebay.

Headway packs work niceley without a BMS if you charge using an RC balance charger....much less stress if you keep your LVC sensible.

[auraslip]

Yeah... it's pretty shitty. Unfortunately, the damage is done... for both parties.

Your posts probably cost them quite a bit of business

[Spacey]

I don't want to cost anyone business, but maybe they should have thought of that in the begining? Word of mouth holds more than advertising and I am not the only one to havme ever complained about them. I knew I was voting for the under dog when I ordered from them in the begining....should have trusted my gut.

But companies can get their shit together so if that has happened then all is well, good has come from it.

[darkshirikens]

Well i don't know how most people one here shop for there batteries but when you have a bad reputation that's like a scar that never fully heals i would try a battery pack but reading reviews and other sort about Evassemble made me not even buy from the even though they have good price but when it comes to customer service and the quality of the products they are most important to me i would pay more as i have many times for the same exact product somewhere else because the cheaper place just throw things together to make a sale and that's not cool I put it simply I'll pay more for quality and good customer service it doesn't have to be absolutely great just has to be there and available and i haven't seen much of that from Evassemble so i wouldn't take the plunge and buy a pack but stay clear !!! I actually have a pack from Headway Headquarters a 72v 24ah pack and paid alot more compared to Evassemble and I'm happy and the guy who made it for me is a cool guy and always answers my question and is very reliable even in the busy season for pack building and he builds the packs as he would build it for himself point is that when somebody cares about what they sale it shows who cares or not I'm' sure anyone could agree with that

[darkshirikens]

Micheal : if you want to get more customers you have to bring your A game i'll even try a pack from you once you build a better reputation but for now until your products and customer service and shipping is reliable i personally can't afford to take the risk
especially when China doesn't really have to abide by U.S laws for merchandise !

[Emoto]

EBJ Your right No wonder i couldnt find it, i think they were $28 at hk dam it hope they restock.

Will be interested to see your test, hopefully you have a fluke.

Just wanted to point out that HK apparently isn't selling Celllog 8s's any more (at least they are not on their website at this time).
I did find them for 34 bucks each from:
http://epbuddy.com/index.php?main_page= ... ucts_id=14
I just ordered 2 of these Celllog 8S's and plan on hooking them up to sound an alarm and also cut the throttle input. I haven't figured out how to do that yet, but I imagine it is pretty simple to do. (will post up on that later)

Last thing I ordered from them (the parallel balance cables) showed up in the mail very quickly.

[julesa]

Well i don't know how most people one here shop for there batteries but when you have a bad reputation that's like a scar that never fully heals i would try a battery pack but reading reviews and other sort about Evassemble made me not even buy from the even though they have good price but when it comes to customer service and the quality of the products they are most important to me i would pay more as i have many times for the same exact product somewhere else because the cheaper place just throw things together to make a sale and that's not cool I put it simply I'll pay more for quality and good customer service it doesn't have to be absolutely great just has to be there and available and i haven't seen much of that from Evassemble so i wouldn't take the plunge and buy a pack but stay clear !!! I actually have a pack from Headway Headquarters a 72v 24ah pack and paid alot more compared to Evassemble and I'm happy and the guy who made it for me is a cool guy and always answers my question and is very reliable even in the busy season for pack building and he builds the packs as he would build it for himself point is that when somebody cares about what they sale it shows who cares or not I'm' sure anyone could agree with that

Full stop. I wouldn't say they have a bad reputation at this point. One or two small but vocal customers have had bad experiences. It sounds like they have tried to resolve the issue, and the customer decided they didn't want to pursue the matter by shipping the problem BMS back to them, which is also understandable. But I wouldn't write them off completely yet.

[neptronix]

progressiverc and some other companies still sell the celllog 8s's, for a reasonable price.

[Gow864]

Well i don't know how most people one here shop for there batteries but when you have a bad reputation that's like a scar that never fully heals i would try a battery pack but reading reviews and other sort about Evassemble made me not even buy from the even though they have good price but when it comes to customer service and the quality of the products they are most important to me i would pay more as i have many times for the same exact product somewhere else because the cheaper place just throw things together to make a sale and that's not cool I put it simply I'll pay more for quality and good customer service it doesn't have to be absolutely great just has to be there and available and i haven't seen much of that from Evassemble so i wouldn't take the plunge and buy a pack but stay clear !!! I actually have a pack from Headway Headquarters a 72v 24ah pack and paid alot more compared to Evassemble and I'm happy and the guy who made it for me is a cool guy and always answers my question and is very reliable even in the busy season for pack building and he builds the packs as he would build it for himself point is that when somebody cares about what they sale it shows who cares or not I'm' sure anyone could agree with that

Full stop. I wouldn't say they have a bad reputation at this point. One or two small but vocal customers have had bad experiences. It sounds like they have tried to resolve the issue, and the customer decided they didn't want to pursue the matter by shipping the problem BMS back to them, which is also understandable. But I wouldn't write them off completely yet.

I purchased a 72V 12Ah pack from this guy. The pack looked OK when it arrived all wrapped up shrink wrap so I plug the charger in and within 5 mins snap crackle pop one dead charger. I contact Michael and I ACTUALLY SENT THE CHARGER BACK. believing that Michael would just lose it in the post I purchased the exact same charger from BMSbattery. plugged it in, 5 mins later the BMS goes snap crackle pop. woo hoo!! I order a BMS from Linda at headway. Well, unpacking this battery was an eye opener. sense wires twisted around washers, ALL nuts were finger tight. Anyhow I install the new BMS only to find that when the original BMS went bang it took a cell with it
crapacitor BMS sucked one cell dry and more. So now I replace the cell put it all back together and after weeks! I have the battery i wanted. then, believe it or not but weeks later like at least 10 weeks later my original charger comes back from China apparently repaired, so I plug it in and bang WITHIN 2 mins it's dead again! It hangs on the wall of my shed as a permanent reminder NEVER TO DO BUSINESS WITH EVARSEMBLE AGAIN!


BTW, I was mailing Michael keeping him in the loop. All that happened was that his English took a turn for the worse. Emails were ignored and never replied to, even though he replied to one of my alias email addys Immediately when inquiring about purchasing a new battery. So, he was there, he just wanted me to go away.

[darkshirikens]

@ julesa nah i one point and time ive did research one Evassemble and it been more than a few mistakes and i hope you know that allot of china based companies if a customer has to send something back at their own cost to china most people would not want to go through the hassle and the companies or people that work there count on that. basically for now im saying people should just be aware that sometimes when lower prices draw you in to buy stuff sometimes its not always as good as it seems
and people are human so we aren't perfect we make mistakes but if people put out the money to but their items they want results, they can become a better company but they need major improvements !

[Spacey]

I know I have sounded unreasonable with this issue, but guys if any of you knew me in real life you would see that I am quite an easy going and forgiving person. But the below quote from this thread sums up my experience 100%, I even did the same thing when Michael would not answer any of my emails...this is with me needing the battery pack to get to work so was kind of important at the time..... I got my mate to inquire about an order, he got an email answer straight away.

I stand by my judgement and statements completely now as yesterday I felt that maybe I was being a bit hard when someone mentioned that I would be hurting his sales.

But when battery packs arrive like that for 3 people now that I know of then people new to this need to be told when Evassemble jump in threads trying to get business.

Quote from Gow864 a couple of posts above:

I purchased a 72V 12Ah pack from this guy. The pack looked OK when it arrived all wrapped up shrink wrap so I plug the charger in and within 5 mins snap crackle pop one dead charger. I contact Michael and I ACTUALLY SENT THE CHARGER BACK. believing that Michael would just lose it in the post I purchased the exact same charger from BMSbattery. plugged it in, 5 mins later the BMS goes snap crackle pop. woo hoo!! I order a BMS from Linda at headway. Well, unpacking this battery was an eye opener. sense wires twisted around washers, ALL nuts were finger tight. Anyhow I install the new BMS only to find that when the original BMS went bang it took a cell with it
crapacitor BMS sucked one cell dry and more. So now I replace the cell put it all back together and after weeks! I have the battery i wanted. then, believe it or not but weeks later like at least 10 weeks later my original charger comes back from China apparently repaired, so I plug it in and bang WITHIN 2 mins it's dead again! It hangs on the wall of my shed as a permanent reminder NEVER TO DO BUSINESS WITH EVARSEMBLE AGAIN!


BTW, I was mailing Michael keeping him in the loop. All that happened was that his English took a turn for the worse. Emails were ignored and never replied to, even though he replied to one of my alias email addys Immediately when inquiring about purchasing a new battery. So, he was there, he just wanted me to go away.

[Pure]

Well the best we can hope for is that he has seen the error of his ways and fixed the shotty construction of his packs. Hopefully he sees that he can't sell garbage like that to the western market if he hopes to keep his sales up.

Its just going to take time. Not only judgeing him by the pack he send to neptronix but also by the packs he sells after that. Time will tell

I can tell you one thing. His reputation on ES is why I didn't purchase my last and current pack from him.