i took care of this thing before using it properly.. these are everywhere in these chinese power bank cases.
USSR wrote:
Yeah, I meant to be asking myhken about how much of a gap in his - and also, anyone else who has the same thing he got (not tab welded), flexible plastic, etc.
Clearly the lottery is powerful in this one.
same is the case for 18650 battery holders .. i posted thier pictures in feedback section of aliexpress but they are probably witheld from beig published by seller .
http://www.aliexpress.com/snapshot/6770973129.html?orderId=68106551564750
very dangerous stuff from china ..
This.
I know you are still on a learning curve but I suspect regulations for selling electrical products in Norway might be a bit tighter than we hold the no-name Chinese sellers accountable to.
IMHO you really need to do a lot more research and testing before setting yourself up as a vendor selling potentially lethal products to the general public.
Unfortunately, there is a "trend" for a small percentage of users in these - let's face it - pretty specialist sites, to ridicule others for buying cheap products expecting that they might get something better than "obvious garbage." There is sometimes a bit of a "well what did you expect" mentality that basically says it is your own fault when you get ripped off.
But whilst it is easy to ignore to ignore self-righteous posts from more experienced users on a forum, it might be a lot more difficult to ignore a lawsuit from a maimed local customer who bought some piece of cheap crap from your shop.
You really need to think very carefully about the risks associated with your new business idea.
My 2c.
some dropshipper in china is a whole lot harder to sue than you are.they simply change names and keep selling the junk.
you would be first on the hook if one of these kills someone.
and many cheap items get no qc.probably what happened here.hard to tell whats wrong but that - contact might be shorting against a trace.
even if it causes a fire where nobody gets hurt the insurance will come after you even if there is no hope to recover the damages from you.
Look at this thread: Gearbest.com want me to delete thread here on BLF to get a refund. how Gearbest.com wanted me to delete this thread before I got my refund from the 11 items I had ordered of the same type that got burned.
So thats how Gearbest.com works, they pay if people remove bad reviews, or negative talk about them.
And I have more proof that I will post later on, how they work (if they don’t take to their senses and just refund me). How they pay for good reviews. And I’m sure lots of people here on this forum also is paid to recommend them and talk positive about their products.
Here is how they care about all the replies in this thread:
What do you think? I’m shocked. I’m live in Norway and is not used to get censored. And of course, I will ask for a paypal refund, if they do not refund me soon.
[quote=myhken] Look at this thread: https://budgetlightforum.com/t/-/34859 how Gearbest.com wanted me to delete this thread before I got my refund from the 11 items I had ordered of the same type that got burned. So thats how Gearbest.com works, they pay if people remove bad reviews, or negative talk about them. And I have more proof that I will post later on, how they work (if they don't take to their senses and just refund me). How they pay for good reviews. And I'm sure lots of people here on this forum also is paid to recommend them and talk positive about their products. Here is how they care about all the replies in this thread: !http://myhken.info/div/010815_ticket5.jpg! What do you think? I'm shocked. I'm live in Norway and is not used to get censored. And of course, I will ask for a paypal refund, if they do not refund me soon. [/quote]
its open market .. and so should be the reviews..
this thread will just spread information not bad words
what was the condition of the cell ?
was it new cell or extracted from battery ?
seems new ?
I call this “no brainer deal”
because whoever refuses Sanyo NCR18650BF cell for US$2.2 has no brain :bigsmile:
The condition was that the cell was delivered straight from a dealer in China, with UPS, that the cell was made this year, that I got the test results and paperwork on the cells. The cells was totally fine, one of 10pcs I took out of the package from China, to test and test, to see if there was fake ones, or reals ones. All 10 batteries checked out on OPUS BT-C3100 and two LiitoKala Lii500 using 1A charge - discharge - charge test on all three testers. So each battery was tested three times.
Then put into plastic holders, stored in a drawer. Each week I have tested the voltage with a multimeter, so I could see if the voltage dropped. It did not, or only 0.1-0.2V. This battery still had 4.20V when I tested it before I put it into the power banks, then red gloving, and flames.
If you look at all the pictures, you will see that I put it in right way. You will see that I did not have other batteries in the PB, for then it had been damage to the positive side on the other side.
The “crack” in the plastic, may have happened when I trow the PB the first time or the second time in the ground. The second time I trow it really hard to brake it, or get the battery out. But I can have overseen it for three weeks.
Any more you want to know?
The point was to put it batteries from 2600mAh to 3500mAh, so the future customers could choose what total mAh they wanted. This out from my battery stock:
8 x Samsung INR18650-25R 3.7V 2500mAh 18650 - 20A - flat top -
4 x LG HE4 3.7v 2500mAh 18650 - 20 A -
50 x Sanyo UR18650ZY 3.7v 2600mah 18650 - flat top -
16 x Samsung ICR18650-26FM 3.7V 2600mAh 18650 - protected -
12 x Samsung ICR18650-26FM 3.7V 2600mAh 18650 - flat top -
8 x Samsung ICR18650-29E 3.7V 2900mAh 18650 - flat top -
8 x Panasonic NCR18650PF 3.7V 2900mAh 18650 - 10 A flat top -
4 x Samsung ICR18650-30B 3.7v 3000mAh 18650 - 6A - flat top -
4 x Samsung INR18650-30Q 3.7V 3000mAh 18650 - 15A - flat top -
37 x Panasonic NCR18650BE 3.7V 3200mAh 18650 - flat top -
37 x Panasonic NCR18650BE 3.7V 3200mAh 18650 - protected -
8 x Samsung ICR18650-32A 3.7V 3200mAh 18650 - flat top -
52 x Sanyo NCR18650BF 3.7V 3400mAh 18650 - 6.8A - flat top -
6 x Panasonic NCR18650B 3.7V 3400mAh 18650 - protected -
12 x Sanyo NCR18650GA 3.6V 3500mah 18650 - 10A - flat top -
12 x LG MJ1 3.7v 3500mAh 18650 - 10 A -
When you do get around to selling these things, can you let us all know what trading name you will be using? Always good to know what sellers to avoid.
He has said he will not be selling these xiaomi style gearbest battery banks.
And he is already helping you know what sellers to avoid, gearbest for one.
Wasn’t aware that GearBest is forcing people to buy products with questionable quality that are not even that cheap when you think about it…
Btw, half of the cells from the list about are not suitable for application in power banks and letting equally battery uneducated folks to choose for themselves would be even worse than selling them empty shitty power bank case.
I just listing all my batteries. All protected cells don’t fit, and no point using high drain batteries. So my plan was to use Sanyo UR18650ZY (2600), Panasonic NCR18650BE (3200) or Sanyo NCR18650BF (3400).
Is that OK for you? Was thinking about a 2900 battery also, but did not want to buy 50 pcs to keep the price down, when I have so many 3200 and 3400 batteries.
I was not forced to buy them, but because of the price and all the info on the product page, with short circuit protection and all, I was sure this was a good product, that I could use, with the three mention battery types. I ordered 1 first, but it took so long time before I got it, that I had ordered 10 more.
I did buy this quality:
Nobody is forcing anyone to buy poor quality products, but nor do I expect dangerous products to be sold.
I personally would have bought a Xaomi, but I wouldnt expect any PB to catch fire.
Marc
Still don't think the problem is the power bank. It must be a combination of the battery (some bad isolation) and the spring prying through the isolation. Maybe the due to an angle when inserting the battery the spring caused it? It's to local to be something else.
Sounds like the power bank then;)
If you were to straighten the spring assembly out…how long a piece of wire do you think it would be…that last battery thru that long run…very thin gauge + long run = high voltage loss
Low voltage of battery put in very high current draw to feed the boost circuit to make 5vdc from say 3.7 or lower vdc, high current flow thru thin wire = heat
I recommend on all parallel connections thru these thin steel springs is to spring bypass with a piece of 22ga copper wire, this way the current flows thru the wire and not that low current flow type spring steel
In fact check out a test one of our awesome member here did showing the voltage loss thru springs (spring #4 looks about the same gauge)…now multiply the loss thru springs x 5-10 times due to the length from the - side to the circuitry at the board (even a full charge battery would probably surge current if it was the first battery placed in that very long high resistance run)
That kind of setup is a very very poor conductor of power…all current is parallel thru battery all concentrated in that one single run
LOL the place for cell holder says AAA but its meant for 18650 .. when will these chinese manafactures learn..
the voltage drop at .5A was 110mV from one end of the sprint to the other end on the pcb.
and these chepos arent able to output 2A .. so 2A output at 5v usb output means roughly 2.5-2.8 A draw from battery .. if there re three battires on this end then it means .5A from each battery for 5 cell bank .. and 1.5 * .1 = .15 watt