10ah 18650 cells

[Whales]

Inflation is spiralling out of control.  We need to re-issue batteries with new units like kmAh to make them convenient again.

[hfleming]

seen some 10000mah lithium ion 18650 calls on ali,anyone tried any?

Yeah, to my shame I drunk-ordered 4 of those 10000mA/h cells out of curiosity. They weigh 22g, whilst my 2200mA/h cells weigh around 48g. From fully charged (4.2V) to empty (2.8V) at 100mA discharge rate, I measured them to be 350mA/h!!!!

[Rick Law]

It is a shame that the fake market makes shopping for "real" 18650 cells practically impossible.  The 18650's are so convenient for small flash light and little electronic gadgets that one can cook up.

With the more modern (slim) laptops, they already moved away from using 18650's.  So even the re-packed/re-skined battery market will have a sourcing problem.  I suppose consumer 18650 market is or will be a thing of the past.

[xvr]

99% of batteries on Ali are a fake Use another supplier (https://hobbyking.com/en_us for example)

[SiliconWizard]

seen some 10000mah lithium ion 18650 calls on ali,anyone tried any?

Yeah, to my shame I drunk-ordered 4 of those 10000mA/h cells out of curiosity. They weigh 22g, whilst my 2200mA/h cells weigh around 48g. From fully charged (4.2V) to empty (2.8V) at 100mA discharge rate, I measured them to be 350mA/h!!!!

Yes.

[Zenith]

It is a shame that the fake market makes shopping for "real" 18650 cells practically impossible.  The 18650's are so convenient for small flash light and little electronic gadgets that one can cook up.

With the more modern (slim) laptops, they already moved away from using 18650's.  So even the re-packed/re-skined battery market will have a sourcing problem.  I suppose consumer 18650 market is or will be a thing of the past.

In the UK there are several battery suppliers with eshops, which look to sell genuine 18650s and other Li-ion cells by major makers. Prices range from £4 to £8 depending on what you want. They seem to be long term businesses, not fly-by-nights selling a load of rubbish and legging it. There must be similar on-line stores in the USA.

There's a huge market for 18650s for vaping, which doesn't look like disappearing any time soon. Another source of good 18650 cells is your local vape shop, although they'll tend to be a particular type.

[Kean]

I bought 48 pcs of HG2 18650 from an AliExpress seller that were specified for 3000mAh down to 2.5V.
I've only been test discharging them so far at 1A to 3.0V, and have been getting pretty consistent readings of 1800mAh.

So not great, but certainly not as bad as some reports I've seen - and for the price I paid compared to local trustworthy suppliers I am happy.
I will be assembling these into packs that go inside some 12V SLA shells for backup power application.

Some of my other purchases of 18650 cells and packs in December/January never arrived, but AE did process refunds on those.

[Zenith]

I bought half a dozen 18650 cells on AliExpress back in the day - 5 years or so back. They were quite cheap. The sellers had good feedback and they appeared to be, according to my charger/analyzer, perfectly good Panasonic 18650 cells. I'm still using them in flashlights.

There were a few suppliers on ebay, who seemed to know what they were selling, and didn't sell 10,000 mAh obvious rubbish. They tested what they were selling and didn't sell tat. I believe ebay got the wind up over the dangers of Li-ion cells, which they they thought were all 18650s and stopped 18650s being sold on their site, although other Li-ion cells could be sold. I haven't looked recently.

These days, if I wanted more, I'd enter "buy 18650 UK" into Google and pick a reputable looking supplier, of which there appear to be several. You can probably buy then from Farnell etc, in which case they are unlikely to be junk.

[bastl_r]

Hi
Buy from nkon.nl if you can.
Always good stuff. No crap.

[Rick Law]

I should think, sourcing manager at Costco should have enough knowledge about batteries to know that 10AH for a LiIon battery pack is dubious could be dubious.  Apparently they didn't.  I can only hope by now they do.

Now what good would a replacement do?  Burn your new house down too?

--------------------------------
Below quoted from Article Published June 22, 2024 1:33pm EDT


567,000 chargers sold at Costco recalled for fire risk Owners of the product should stop using it and contact myCharge for a replacement

Three portable charger models that were sold exclusively at Costco are being recalled after two house fires were blamed on the unit overheating.

The United States Consumer Product Safety Commission announced the recall in a June 20, 2024, release.

The recalled units are the "myCharge POWER HUB All-In-One 10,000mAh" chargers carrying the model numbers "AO10FK-A," "AO10FK-B," and "AO10FK-C," said the commission.

Link to original article:
^{https://www.foxbusiness.com/lifestyle/567000-chargers-sold-costco-recalled-fire-risk}

Edit:
Changed "is dubious" to "could be dubious"
Looking at the slim size packaging again (photo is the original article when scrolling down), there isn't room for a larger then typical cell phone size battery.  But possibly they could have three squeezed in.  Possibly, but would be very tight squeeze.  So "could be dubious" instead of "is dubious".

[tooki]

Hi
Buy from nkon.nl if you can.
Always good stuff. No crap.

A good EU source for genuine lithium ion cells is Reichelt, based in Germany.

[Refrigerator]

Not to brag but I've actually held a genuine Ultrafire battery in my hands.
Yes it had the protection board and yes it had the rated capacity.
A true rarity, i'm sure, just like the TowerPro MG995 was back in the day.

[pcprogrammer]

I bought 48 pcs of HG2 18650 from an AliExpress seller that were specified for 3000mAh down to 2.5V.
I've only been test discharging them so far at 1A to 3.0V, and have been getting pretty consistent readings of 1800mAh.

So not great, but certainly not as bad as some reports I've seen - and for the price I paid compared to local trustworthy suppliers I am happy.
I will be assembling these into packs that go inside some 12V SLA shells for backup power application.

What spread in parameters can one expect when ordering a batch of the more reputable 18650 batteries from one of the places mentioned here? For instance these: https://www.nkon.nl/fr/sony-us18650vtc4-flat-top.html

I understood that for assembling a battery pack it is important to match not only the capacity, but also the internal resistance and for this I wonder how many batteries one would need to get to get 20 matching batteries. The pack I need them for is made up of two cells in parallel and 10 of these in series.

I also read that for a string in series the capacities need to match as much as possible, but for parallel this does not matter that much. Is this true?

[AVGresponding]

I bought 48 pcs of HG2 18650 from an AliExpress seller that were specified for 3000mAh down to 2.5V.
I've only been test discharging them so far at 1A to 3.0V, and have been getting pretty consistent readings of 1800mAh.

So not great, but certainly not as bad as some reports I've seen - and for the price I paid compared to local trustworthy suppliers I am happy.
I will be assembling these into packs that go inside some 12V SLA shells for backup power application.

What spread in parameters can one expect when ordering a batch of the more reputable 18650 batteries from one of the places mentioned here? For instance these: https://www.nkon.nl/fr/sony-us18650vtc4-flat-top.html

I understood that for assembling a battery pack it is important to match not only the capacity, but also the internal resistance and for this I wonder how many batteries one would need to get to get 20 matching batteries. The pack I need them for is made up of two cells in parallel and 10 of these in series.

I also read that for a string in series the capacities need to match as much as possible, but for parallel this does not matter that much. Is this true?

Kind of, but bear in mind that if the capacities are very different, you need to limit the charge current to a friendly level for the lowest capacity cell

[pcprogrammer]

Kind of, but bear in mind that if the capacities are very different, you need to limit the charge current to a friendly level for the lowest capacity cell

I read that too. This is just to make sure that if the other cell(s) go bust the charge current won't be to high to ruin the remaining cell.

It is an interesting subject with the necessary pitfalls and you can't just go on what is on the internet. Someone told me that Liitokala batteries are reasonably good as long as you buy them from a reputable store. Bought six from here: https://nl.aliexpress.com/item/32805750680.html but they seem to be fake or at least reclaimed. Capacities are no where near the VTC4 specifications. 

I got into this because an original Husqvarna battery pack is very expensive and with only two dead cells, repairing should be way cheaper, but with all the stuff I bought for playing with Liion cells a new pack would not have been that more expensive. 

Got a battery spot welder, an Atorch DL24 150W electronic load, two Liitokala chargers (Lii-500 and Lii-M4S), a YT1035+ resistance meter, two four wire battery holders and a bunch of other battery related stuff. But that is always handy for other projects.