Search found 469 matches

by Pajda
May 22 2022 5:47am
Forum: Battery Technology
Topic: Cycle life tests of High Energy density cylindrical cells
Replies: 26
Views: 2269

Re: Cycle life tests of High Energy density cylindrical cells

Where? These results are in updated graphs and table in the first post. Particularly are added charts after 1000 cycles of voltage drops and temperature rise. it is also interesting to point out that the DCIR values and the associated temperature rise after 1000 cycles are slightly better than on t...
by Pajda
May 21 2022 12:15pm
Forum: Battery Technology
Topic: Cycle life tests of High Power density cylindrical cells
Replies: 16
Views: 1660

Re: Cycle life tests of High Power density cylindrical cells

mall update after a while

added full data for 25R8 and CNP25, unfortunatelly I cannot find a 21700VTC6 Sony 1000cycle sample
by Pajda
May 21 2022 7:03am
Forum: Battery Technology
Topic: Cycle life tests of High Energy density cylindrical cells
Replies: 26
Views: 2269

Re: Cycle life tests of High Energy density cylindrical cells

Small update after a while

added final graphs and values after 1000 cycles for BAK CG50 and Lishen 21700SD
by Pajda
May 14 2022 3:46am
Forum: Battery Technology
Topic: Cycle life tests of High Energy density cylindrical cells
Replies: 26
Views: 2269

Re: Cycle life tests of High Energy density cylindrical cells

Small update after a while

Lishen 18650HB (3350 mAh) and EVE INR18650-33V (3100 mAh), both samples from Nkon added to the test this week.

Finally, I have back access to my Temperature Chamber, so I would add other test results within a week.
by Pajda
May 14 2022 3:41am
Forum: Battery Technology
Topic: Cycle life tests of High Energy density cylindrical cells
Replies: 26
Views: 2269

Re: Cycle life tests of High Energy density cylindrical cells

Have you tested 50s? Have photo? Expect them to have it at gen2 now I recently moved actually running 50S test results from this HE chart to the HP one in the second ES thread. The tested "green tube" sample comes from NKON (you can find photos here) and it seems to be Gen1. I found some ...
by Pajda
May 04 2022 1:48pm
Forum: Battery Technology
Topic: Cycle life tests of High Power density cylindrical cells
Replies: 16
Views: 1660

Re: Cycle life tests of High Power density cylindrical cells

Small update after a while

SAMSUNG INR21700-40T3
- I recently started a test at 1C 90% DoD. To maintain consistency, the results will be placed in the chart for the HP 1C category, though the results can be directly comparable to HE cells.

Molicel INR21700-P42A
- will start this week
by Pajda
Apr 22 2022 3:07am
Forum: Battery Technology
Topic: Cycle life tests of High Power density cylindrical cells
Replies: 16
Views: 1660

Re: Cycle life tests of High Power density cylindrical cells

Small update after a while BAK N18650CNP-25 and SAMSUNG INR18650-25R8 - both cells finished 1000 cycles at 5C @ 100% DoD. From this synthetic test BAK perform a little better, it gives more energy and in particular the increase of internal DCIR is significantly slower. On the other hand, BAK capacit...
by Pajda
Apr 16 2022 3:15am
Forum: Battery Technology
Topic: Cycle life tests of High Energy density cylindrical cells
Replies: 26
Views: 2269

Re: Cycle life tests of High Energy density cylindrical cells

Chart is showing some pretty significant capacity recovery from the end to the beginning of each 50-cycle run with the 50E2. What would you say is the average time between each run to get this effect? I see you have the same effect with most of the other cells tested here too, although to a lesser ...
by Pajda
Apr 16 2022 2:07am
Forum: Battery Technology
Topic: Cycle life tests of High Energy density cylindrical cells
Replies: 26
Views: 2269

Re: Cycle life tests of High Energy density cylindrical cells

Small update after a while Samsung INR21700-50S - Nkon few weeks ago listed them in their store. I was able to order samples from there before they went out of stock. This cell is interesting in terms of representing the "best energy-power performance ratio on the market" (at least until t...
by Pajda
Mar 03 2022 4:55am
Forum: Battery Technology
Topic: Cycle life tests of High Energy density cylindrical cells
Replies: 26
Views: 2269

Re: Cycle life tests of High Energy density cylindrical cells

The cell you're calling a Plaid cell is not actually sourced from a Plaid Model S right? Yup, tested sample was sourced by Vapcell as original Panasonic NCR18650T1. The reasons why this type is referred as "Tesla Plaid" are two: First, it has the same unique mechanical design of positive ...
by Pajda
Mar 03 2022 3:41am
Forum: Battery Technology
Topic: Cycle life tests of High Energy density cylindrical cells
Replies: 26
Views: 2269

Re: Cycle life tests of High Energy density cylindrical cells

Small update after a while Panasonic NCR18650T1 (aka Tesla Plaid cell) - For those who are familiar with Tesla/Panasonic cell performance it is no surprise. Cell shows similar results (capacity fade) as another cells from 18650 line used by Tesla BAK N18650CP-35 - A cell promising very good price-pe...
by Pajda
Jan 10 2022 2:43pm
Forum: Battery Technology
Topic: Cycle life tests of High Energy density cylindrical cells
Replies: 26
Views: 2269

Re: Cycle life tests of High Energy density cylindrical cells

can you try eve 26v? They are inside some xiaomi scooter battery packs Probably not in the near future. The reason is that this cell does not fit into the HE or HP category. But that doesn't mean it's a bad choice, it just deserves its own category, something like "good price-performance ratio...
by Pajda
Jan 06 2022 9:44am
Forum: EV Business World
Topic: BYD's LFP blade batteries - heavy but extremely safe.
Replies: 5
Views: 630

Re: BYD's LFP blade batteries - heavy but extremely safe.

Actually, you can already order a sample on Aliexpress. Thanks to the length of 960 mm, it will be a questionable for use elsewhere than in cars or stationary applications.
by Pajda
Jan 05 2022 1:02pm
Forum: Battery Technology
Topic: Cycle life tests of High Energy density cylindrical cells
Replies: 26
Views: 2269

Re: Cycle life tests of High Energy density cylindrical cells

added LG M50LT to the test. Q: What to expect in this thread until next christmas? :wink: I would like to add two more cells from 18650 category. The idea is to have one branded cell in each format and two cost@avalability effective alternatives from "less recognized manufacturers(for now)"...
by Pajda
Jan 04 2022 1:49pm
Forum: Battery Technology
Topic: Cycle life tests of High Power density cylindrical cells
Replies: 16
Views: 1660

Re: Cycle life tests of High Power density cylindrical cells

I finally found a sample of the cycled VTC6 and added this to the graphs and table. This VTC6 sample lay in a box at room temperature for about 2 years after the end of the 1000 cycle of Standard power rate test and after then the final test for the graphs and table was performed.
by Pajda
Dec 26 2021 8:22am
Forum: Battery Technology
Topic: Cycle life tests of High Energy density cylindrical cells
Replies: 26
Views: 2269

Re: Cycle life tests of High Energy density cylindrical cells

From santa, I got a reaction to the previous thread:
We've been following the thread day by day honestly all year, and we only get one new result (and even not fully documented) for that? :cry: :cry: :cry:
I admit my mistake and please take this new thread as a small compensation :wink:
by Pajda
Dec 26 2021 8:15am
Forum: Battery Technology
Topic: Cycle life tests of High Energy density cylindrical cells
Replies: 26
Views: 2269

Cycle life tests of High Energy density cylindrical cells

"Standard Power Rate" test (1C continuous discharge) note: the 1C discharge test is performed at ca 90% DoD (4.15V-3.00V) Test eqiupment: - 2pcs ZKETECH EBC-X0510 - BF-2A four-wire cell fixture (10A version with Nickel plated contacts) - tested in room with relatively stable temperature 2...
by Pajda
Dec 24 2021 9:23am
Forum: Battery Technology
Topic: Cycle life tests of High Power density cylindrical cells
Replies: 16
Views: 1660

Re: Cycle life tests of High Power density cylindrical cells

"High Power Rate" test (5C continuous discharge) migrated from older thread https://endless-sphere.com/forums/viewtopic.php?f=14&t=103092&start=475#p1606780 note: the 5C discharge test is performed at ca 100% DoD (4.20V-2.50V) Test eqiupment: - 2pcs ZKETECH EBC-A40L - 3pcs ZKETECH...
by Pajda
Dec 24 2021 9:22am
Forum: Battery Technology
Topic: Cycle life tests of High Power density cylindrical cells
Replies: 16
Views: 1660

Cycle life tests of High Power density cylindrical cells

"Standard Power Rate" test (1C continuous discharge) note: the 1C discharge test is performed at ca 90% DoD (4.15V-3.00V) Test eqiupment: - 2pcs ZKETECH EBC-X0510 - BF-2A four-wire cell fixture (10A version with Nickel plated contacts) - tested in room with relatively stable temperature 2...
by Pajda
Dec 12 2021 4:40pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 576
Views: 74088

Re: Li-ion cells cycle ageing

Pajda's Comments and Thoughts (PCT): - Samsung 40T3 finaly reach 1000 cycles, it will now pass the final test on precision tester in TC to complete the data table and then will be inducted into the Hall of Fame. - Samsung 25R8 had a bad start, where due to a faulty data cable I lost the first few da...
by Pajda
Dec 10 2021 7:23am
Forum: Battery Technology
Topic: News from AABC
Replies: 4
Views: 244

Re: News from AABC

I was excited about the GM Ultium battery system. Ultium is a skateboard type platform for GM's EV's. The (flat) battery box contains their modules. The reason it's exciting is that they are designing for second life use, which means that they will be usable for aftermarket applications like ebikes...
by Pajda
Dec 04 2021 3:54pm
Forum: Battery Technology
Topic: Deep Discharge of LI Ion LMO Cells
Replies: 7
Views: 394

Re: Deep Discharge of LI Ion LMO Cells

It depends... I saw a lot cells of different chemistries (NMC, NCA, LFP) discharged below 1V and after recovery they served well like nothing was happened. The most problematic in this case was LCO cells (aka LIPO). So you have these options: 1) throw the battery in the trash 2) try to recover the c...