Tabless design cylindrical cells tests
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Souvlucky
100 mW
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Very interesting!Looks like Varta in Germany is also producing tabless, appears to be a bit behind the Chinese manufacturers though:
V4DRIVE | Generation 1 - The high-performance booster cell for hybrid vehicles
Generation 1 cells impress with their fast-charging capability of less than 6 minutes, excellent cycle stability and long service life.www.v4drive.com
Worth a read: Porsche considers acquiring a stake in Varta battery subsidiary V4Drive - electrive.com
Their V21700-H50 could be interesting—though by end of 2025, there might be other interesting alternatives out there.
Let's see!
BlueSwordM
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Yeah. By 2026, we might have tabless Li-Sulfur cathodes with 30% Si anodes cells with energy densities in the 500-600Wh/kg range 
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thermal_runaway
10 mW
Interesting chart! I'm not sure how they're rating power density since the numbers on that chart are lower than their datasheet (UHP-26 has max specific power of 17kW/L pulsed). Designation also indicates only "High Power" vs "Ultra High Power".
We should see production 5Ah tabless cells with ~60-70A capabilities by mid-2025 with >5Ah pre-production sampling; it'll certainly be a tough market.
Souvlucky
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@thermal_runaway look, a pleasant surprise!
(Sorry @Pajda, it couldn't be helped!)
Seems like pre-production V4Drive 21700 5.xAh cells.
Batemo tested them at 18.8 Wh at C/10.
Nominal rating given is 5.40Ah.
Pretty solid competition to the P50B at the stage!
Though probably not available for purchase anytime soon...
V4Drive V21700HEP-5.X(A0) left / Molicel INR-21700-P50B right
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thermal_runaway
10 mW
These just came in, supposedly an Ampace JP40 on the bottom but we'll see when I toss it under load...
Pajda
10 kW
So the BAK 45D seems to be first tabless cell with 4500 mAh available on the market.
thermal_runaway
10 mW
I unfortunately did not have much time to test but initial impressions are that it's about competitive with the 40PL (so is at least authentic, or someone is selling rewrapped 40PLs
. Somewhat oddly seems to have higher DCIR at low SoC but equivalent everywhere else.Yeah, BAK seems to be the furthest along here among the major Chinese brands especially in offering a wide range of capacities from 4Ah up. I believe they have been supplying OEMs since earlier this year based on vendors telling me the 40D and 45D were available as extracted cells (same with Murata VX40s), although these are fresh from factory.
EVE's tabless lineup (46xx aside) as far as I have been told is currently only planned to be the 3Ah 18650 and 4Ah/5Ah 21700.
I believe Tenpower has only announced a 4Ah, Lishen has their 4Ah/5Ah product plan. Although for both companies their reps have not been very responsive.
The EVE 4695E datasheet
interesting, a bit different info compared to this previous info:
Tabless design cylindrical cells tests
Some preliminary test info on the Lishen 21700-5.0Ah tabless cell (LR2170LE-P or LR2170-5.0Ah), for those interested:
endless-sphere.com
So it't 30Ah which is also not bad, but now I am confused because Pajda tested P variant and got 32Ah, shouldn't this E version have more? Also they are rated to 4.2V max charge after all, is that the difference (30 vs earlier 32Ah)?
Also looks a bit different compared to this pic:
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Pajda
10 kW
added more cycles for EVE4680 sample in the midle of this post Tabless design cylindrical cells tests
I hope you have seen this, great results!
www.e-cigarette-forum.com
Bench Test Results: LT 22710A (Ampace JP40?) - 60A 4000mAh 21700
These tests below only note my personal opinion for the ESTIMATED ratings for the batteries I tested at the time I tested them. Any battery that is not a genuine Samsung, Sony, Murata, LG, Panasonic, Molicel, EVE, Lishen, BAK, or Sanyo can change...
www.e-cigarette-forum.com
BlueSwordM
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Incredible high cycle life if it continues decreasing linearly/logarithmically.I hope you have seen this, great results!
Bench Test Results: LT 22710A (Ampace JP40?) - 60A 4000mAh 21700
These tests below only note my personal opinion for the ESTIMATED ratings for the batteries I tested at the time I tested them. Any battery that is not a genuine Samsung, Sony, Murata, LG, Panasonic, Molicel, EVE, Lishen, BAK, or Sanyo can change...
Pajda
10 kW
Mooch did again a great job. I asked 18650-21700.com site if they send me JP40 and AM3 samples, as they seem to be the only one distributor so far.
BlueSwordM
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Wow. The AM03 looks to be a kickass cell.
Its voltage drop is considerably lower than a 35E/EVE 35V at the same current draw, which means there was a big resistance cut somewhere its its design.
Is it tabless? Possibly, but there are probably other improvements even though tabs are often a big bottleneck for HE cells.
Pajda
10 kW
So it went fast. Austin from 18650-21700.com answered me back promptly that it should be no problem to send me samples of JP40 and AM03 for testing now and samples of AM04 and AM05 in near future.
The available info about the AM03 is that it is an 18650 format cell with ca 4Ah @ 13.5Wh at 2C discharge. So definitely a very interesting contender in the HE category. 18650 AM03 - High Energy Cell with 8a Discharge Rate
18650-21700.com want to use their AMxx brand on the cells they sell and below is their roadmap. We'll see if they disclose the original cell manufacturers in the future as they did with the Ampace JP40.
The available info about the AM03 is that it is an 18650 format cell with ca 4Ah @ 13.5Wh at 2C discharge. So definitely a very interesting contender in the HE category. 18650 AM03 - High Energy Cell with 8a Discharge Rate
18650-21700.com want to use their AMxx brand on the cells they sell and below is their roadmap. We'll see if they disclose the original cell manufacturers in the future as they did with the Ampace JP40.
Not sure if this is of any use, if not, I can delete it just let me know, simply searching for tabless cells got me this:
lib.energy
Tabless Lithium Cells: 26650 & 21700 with Next-Gen Power
Explore the future of battery tech with our Tabless Lithium Cells. Our 26650 and 21700 models offer unmatched power density and safety.
lib.energy
CamLight
10 kW
More testing is ongoing but here’s some info on the cycle life of EVE 40PL cells available now. After 200 abusive cycles*** the run time/capacity of the cell only dropped 5.6%. Significantly better than the very disappointing cycle life of the (presumably) pre-production cell(s) @Pajda tested.
***5A charge to 4.20V (terminated at 500mA), 0-60 second rest, 30A discharge to 2.50V, allow cell temp to drop to 40°C-45°C, repeat.
***5A charge to 4.20V (terminated at 500mA), 0-60 second rest, 30A discharge to 2.50V, allow cell temp to drop to 40°C-45°C, repeat.
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