10ah 18650 cells

[p.larner]

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

[beanflying]

1V @ 10,000 mAh if you are lucky and have a 100% efficient way of getting there.

They have been pulling that same garbage with powerbanks for years. Work on the basis that there is always one more sucker to take their money from.

[Shonky]

Yep, no way these are a thing.

If they were you'd be seeing them in many other places e.g. the typical 18V (and other voltage) tool packs.

[Kean]

Total nonsense specification.  The only way they could get that is based on step down to a lower voltage as mentioned by beanflying.

From what I've seen available from reputable Li-Ion suppliers right now.
18650 max out at about 3500mAh per cell
26650 max out at about 5500mAh (maybe 6000) per cell

Batteries capacities based on mAh are often useless.  Even a Wh rating is useless if you don't know the test conditions, but at least the numbers still make sense for series/parallel packs (if done properly).

[Whales]

The 10Ah is completely false.  I don't think you can even get 4Ah, the highest I've seen is around 3.2 or 3.5 or so.

EDIT: I tried finding sources for these photos on tineye, but some of them have lost hosting over the years.  They're not mine.

[Haenk]

Impressive, how much effort they put into faking these cells. Certainly 10/10 for effort.

[Whales]

They're not always fakes like those photos.   Some are second hand cells that (perhaps) might have once had a higher capacity, but are now worn out.  I've read about people buying batches of 18650's where each cell's metal case and insulator all look different, but the same heatshrink has been applied, so they're just random 2nd hand cells that have been reskinned.  There is no shortage of those and it's probably (?) more profitable to re-use this way than dismantle and recycle materials.

[Dan123456]

The 10Ah is completely false.  I don't think you can even get 4Ah, the highest I've seen is around 3.2 or 3.5 or so.

EDIT: I tried finding sources for these photos on tineye, but some of them have lost hosting over the years.  They're not mine.

Lol 

I figured they would just relabel shitty cells… not take the time and effort to put a battery in a battery 

I actually have one of those 3000mAh Ultrafire batteries that came in one of those cheap “high power” laser pointers 

I knew it was sus and nowhere near 3000mAh but am definitely gonna have to pull it apart once it dies (I’m sure that won’t be too long) to see if it looks the same on the inside 

[p.larner]

I had exactly the same laser pointer 3ah 18650 cell,after a year of little use it tested at 65mah on my litokala li-500 tester so when new guess it was possibly 800mah!,the bar stuards!

[AndyBeez]

These cells are rather dangerous when it comes to charging them as they clearly 'under rated and over stated'.

A question for Joe or Jocelyn Public. What capacity charger can you use to charge a 1000000Ah lantern cell? Correct, the BIGGEST one they sell on Amazon.

And how many milliamp hours will the battery take before emitting the white smoke of doom? Correct, none.

[wraper]

You'd be lucky if they ship used cells in semi-decent condition. But most likely you'll get total garbage with about 0.5-0.7Ah capacity.

[Whales]

I had exactly the same laser pointer 3ah 18650 cell,after a year of little use it tested at 65mah on my litokala li-500 tester so when new guess it was possibly 800mah!,the bar stuards!

Don't charge that at too high of C rate 

[Zenith]

There are three first league manufacturers, LG, Samsung and Panasonic/Sanyo. Last time I looked, the highest capacity 18650 any of them made was 3,600 mAh, and they weren't easy to find. They all make 3,500 mAh 18650s.

You can take claims of anything over 3,600 mAh, as nonsense.

From what I've seen, the supposed 9,900 mAh cells are recovered from old laptop battery packs and relabeled. You'd be lucky to find they had a 1,000 mAh capacity - most can't manage that.

There are a few Youtube videos on this.

[SiliconWizard]

You'd be lucky if they ship used cells in semi-decent condition. But most likely you'll get total garbage with about 0.5-0.7Ah capacity.

Yep that'll be about it. 

[amyk]

Some of these ridiculously high advertised capacity cells are not used but actually newly made low-capacity cells with a deficit of material inside.

https://lygte-info.dk/info/batteryDisassemblyUltraFire%20UK.html

[SiliconWizard]

Some of these ridiculously high advertised capacity cells are not used but actually newly made low-capacity cells with a deficit of material inside.

https://lygte-info.dk/info/batteryDisassemblyUltraFire%20UK.html

Thanks for the article. These Ultrafire batteries are pretty common, so interesting to see. I do have a few of them.
And yes they never met their rated capacity, now we can see why (and I mean the 3000mAh kind here, so something that looked actually plausible).

[luudee]

This is an excellent site, for everything and anything about batteries (and fakes):

https://batteryuniversity.com/

Cheers,
rudi

[Whales]

These Ultrafire batteries are pretty common, so interesting to see. I do have a few of them.

[AVGresponding]

Must have had cider and a curry the night before, like me!   

[AndyBeez]

So what happens when you apply a mechanical compressive force to a 18650 cell?

This is possibly the most sobering video on YT this week. Seriously, if you own any single or combi 18650 cells, you need to watch this.

Crushing Huge Lithium Ion Batteries with Hydraulic Press

https://youtu.be/t1j9TUV5coc?si=ZeymbqYkkbgNYEnM

[Whales]

Common beginners error, they should be using plastic press heads so they don't short the battery during measurement.

[Ben321]

1V @ 10,000 mAh if you are lucky and have a 100% efficient way of getting there.

They have been pulling that same garbage with powerbanks for years. Work on the basis that there is always one more sucker to take their money from.

claims of 2 million mA hours are fake, but 10000 mA hours isn't unexpected for a modern lithium ion battery.

[Kean]

claims of 2 million mA hours are fake, but 10000 mA hours isn't unexpected for a modern lithium ion battery.

Be careful about mixing up the term battery with cell.  This topic is about 18650 cells.  No single commonly available 18650 cell right now will be more than about 3500 mAh as mentioned above.

A battery (pack) with several 18650 cells in parallel can certainly reach 10000 mAh.  In fact there is no reason a pack cannot reach 2 million mAh if you paralleled about 600 cells, but that would be an expensive solution.

[Ben321]

claims of 2 million mA hours are fake, but 10000 mA hours isn't unexpected for a modern lithium ion battery.

Be careful about mixing up the term battery with cell.  This topic is about 18650 cells.  No single commonly available 18650 cell right now will be more than about 3500 mAh as mentioned above.

A battery (pack) with several 18650 cells in parallel can certainly reach 10000 mAh.  In fact there is no reason a pack cannot reach 2 million mAh if you paralleled about 600 cells, but that would be an expensive solution.

Sorry. I meant a single cell.

[miegapele]

Only 10Ah? that's amateurish. I have been using 99,000 mAh 18650 batteries with my 12,000,000 lumen flashlight and it works very good .