Search found 339 matches

by Pajda
Sep 29 2019 4:45am
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 15731

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

Pajda what is your favorite cell 18650 high discharge long life ? It depends on many factors and applications so there is no clear favorite, but on the other hand, you can't choose completely wrong. If we are talking about 18650 size, "3000 mAh" capacity then we have LG HG2, Samsung 30Q and Sony VT...
by Pajda
Sep 28 2019 12:55pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 15731

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

so far i have detailed data about the 29E(6 and 7), PF, GA, BD, 35E, 25R, MH1 and probably a couple i forgot. and ofcouse a crapload of chinese junk. and my tests are realistic or done on cells that have been in use for years of daily cycles so that is actual usable data and it does give a better i...
by Pajda
Sep 28 2019 12:40pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 15731

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

..this is partially also the reason why tesla still uses a 3350mAh cell in the model S instead of 3500+mAh. it would give a tesla 10kWh extra storage but it would absolutely murder the lifespan of the battery. First I must say, that I have not already tested cells from "100"kWh Tesla battery pack. ...
by Pajda
Sep 28 2019 12:25pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 15731

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

"anything higher capacity will die off quicker" ..... that is only flippy ´s opinion, as he prefers 29E above all. Read again Pajda´s reports. He has biggest collection of really tested cells, bigger than anybody else here. sorry, but its not a opinion, its a measured fact. anyone that has done lif...
by Pajda
Sep 28 2019 11:53am
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 15731

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

So, only questions remaining, with an average load of 12-14A and short peek loads of ~50A: 1) Will the LG M29, Samsung 29E (E6 that would be, nkon don't have enough E7 in stock), or Panasonic PF perform more or less identical, or does one stand out as a better option (ignore the price)? 2) Will a M...
by Pajda
Sep 20 2019 2:21pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 15731

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

So i'm falling more towards the PF or 29e then, understanding this is a better option then the GA in the long run as they are both cheaper and last longer, with the downside being less initial capacity and more voltage sag. When comparing these two cells, which would be the better one? They cost ex...
by Pajda
Sep 19 2019 3:28pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 15731

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

Thanks that's good to hear. When looking at the datasheet, it shows 70% lifecycle after 500 cycles: https://produktinfo.conrad.com/datenblaetter/1500000-1599999/001558879-da-01-en-LG_LIION_AKKU_INR18650MH1__3200MAH.pdf It's actually less than the NCR18650BD which has close to 80% after 500 cycles? ...
by Pajda
Sep 19 2019 2:44pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 15731

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

Anyway all of the BD,BE,BM line is outdated and there are much better choices for DIYers. What are the better ones which would make sense financially? If you insist on 3200 mAh capacity then it is LG MH1. This cell is used by many ebike producers and it has significantly better operational life tha...
by Pajda
Sep 19 2019 2:20pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 15731

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

I see some of you recommend NCR, and some say forget the GA, so i'm a bit confused.. This contradiction is based on fact, that many users of GA usually does not have comparison with other cells after even few cycles. GA shows very nice parameters under initial capacity/internal resistance test as a...
by Pajda
Sep 19 2019 11:38am
Forum: Battery Technology
Topic: Tesla/Dahn Lithium-NMC532/AG chemistry
Replies: 19
Views: 1019

Re: Tesla/Dahn Lithium-NMC532/AG chemistry

.......i just hope that the new generation S has the model 3 cells when they start selling the plaid 3 motor kit. putting down nearly 10.000nm of torques into some poor tires is going to be awesome....... 10,000Nm ! :shock: ....that would truely be more than Awesome ! :lol: Actually it is not extra...
by Pajda
Sep 19 2019 2:27am
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 15731

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

Isnt the BD basicly the Tesla cell ? Basically yes, I never tested BD to confirm it, but from info what i have the BD seems to be a twin of BE (BE is Tesla cell from original 85 battery) both with older NCA+C chemistry. The only difference is by my opinion that BE does have bottom vent and BD does ...
by Pajda
Sep 05 2019 1:43am
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 20667

Re: Boston-Power Swing 5300 Li-ion cell test

I finally got that magical 5300mah these cells are advertised at. Of course, as I've pointed out all along, at this discharge rate and voltage levels, there's no real world application that will get you 5300mah. I charged to 4.2v and discharged to 3.75v at .2C. The voltage you see on the LCD is rec...
by Pajda
Sep 01 2019 3:00am
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 20667

Re: Boston-Power Swing 5300 Li-ion cell test

ElectricGod wrote:
Sep 01 2019 12:25am
.. or 4939 mah per cell is a bit short of 5300mah. The voltages displayed are recovery. The cells discharged down to 2.75v each.
This value is from 4.1V-2.75V range or full range 4.2V-2.75V?
by Pajda
Aug 30 2019 2:30pm
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 20667

Re: Boston-Power Swing 5300 Li-ion cell test

Does anybody understand what problem does ElectricGod have with Boston cells? He measured capacity 4761 mAh in the range 4.1V-3V with 0.85A discharge current per cell. This equals to ca 90% DoD and this result is completelly fine for this cell. If you need rated capacity from each cell on the market...
by Pajda
Aug 29 2019 2:30pm
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 20667

Re: Boston-Power Swing 5300 Li-ion cell test

Just for the info. Boston Swing5300 mAh cell, made in China, after two years of resting in paperbox under the table in the office. Nominal capacity test made on $$$..$$ professional battery tester (0.7C charge, 0.2C discharge at 100% DoD 4.2V-2.75V): 5345 mAh / 19.56 Wh / 10s DCIR test at 50% DoD: 2...
by Pajda
Aug 16 2019 1:48pm
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 20667

Re: Boston-Power Swing 5300 Li-ion cell test

Hmm.. it seems to me that you summarized well known things about Boston Swing. :wink: Yes, the main reason to go with Boston is the price per kWh. One of my favorite suppliers actually offers Boston 5300mAh ca 5% cheaper than NCR18650B 3400mAh in low volume orders.
by Pajda
Aug 14 2019 9:30am
Forum: Battery Technology
Topic: Samsung 29E ver.7 (29E7) 2900mAh cell's capacity test + comparison with 29E ver.6
Replies: 9
Views: 733

Re: Samsung 29E ver.7 (29E7) 2900mAh cell's capacity test + comparison with 29E ver.6

Thanks flippy for the info, LG M29 seems to be slightly better than E6 in cycle life, so E7 should be equal. I did not test E7. I am curious if E7 can match M29 in 1C continuous charge rate cycle life
by Pajda
Aug 12 2019 8:33am
Forum: Battery Technology
Topic: LG HG2 life expectancy
Replies: 7
Views: 890

Re: LG HG2 life expectancy

Hi all, Without doing the experiments myself I want to try and figure out ROUGHLY how many cycles I can get out this pack and what the degradation in total capacity looks like over the cycles (e.g. every 50-100 cycles) If we assume I discharge to 70% DOD and discharge at 2C and charge at 0.5C Anyon...
by Pajda
Aug 10 2019 4:12am
Forum: Battery Technology
Topic: LG M50T Grade A high capacity 5000mAh 21700 cell's test
Replies: 10
Views: 2305

Re: LG M50T Grade A high capacity 5000mAh 21700 cell's test

Good point about M50T cycle life. I was satisfied with cycle life of initial "B-grade" M50 production from LG (cells without any marking, with bottom vent) so I expected even more from A-grade. But in the meantime I got this M50T for testing and recently an "A-grade" M50 (with marking without T and ...
by Pajda
Aug 08 2019 7:40am
Forum: Battery Technology
Topic: Awesome study / information on NCA battery degradation (Panasonic NCR18650PD)
Replies: 18
Views: 1540

Re: Awesome study / information on NCA battery degradation (Panasonic NCR18650PD)

Little offtopic. I found original 100pcs paper carton with few forgotten LG HG2 cells (supplied by Nkon in 4/2017). The code on cells is P342L072A3 which says that they were manufactured in December 2016. They were supplied with 30% SoC (it was written on the carton and the voltage when arrived was ...
by Pajda
Jul 30 2019 10:40am
Forum: Battery Technology
Topic: Awesome study / information on NCA battery degradation (Panasonic NCR18650PD)
Replies: 18
Views: 1540

Re: Awesome study / information on NCA battery degradation (Panasonic NCR18650PD)

Is it worth it ? For me, definitely yes. You're a special case :D By the way Figure 3: Calendar aging which you posted only confirmed what I am trying to explain. This graph construction can be a little tricky. If one set the fixed charging voltage to 4.1V (90% SoC) then the aging course of usable ...
by Pajda
Jul 29 2019 1:32pm
Forum: Battery Technology
Topic: Awesome study / information on NCA battery degradation (Panasonic NCR18650PD)
Replies: 18
Views: 1540

Re: Awesome study / information on NCA battery degradation (Panasonic NCR18650PD)

I found this thesis as excellent guide how to evaluate/test the battery cell. (By the way I wonder if the author reads this forum :wink: ) But.. :D as I have repeated several times this evaluation/results are valid only for this particular cell NCR18650PD. Even other Panasonic NCA cells have signifi...
by Pajda
Jul 28 2019 7:30am
Forum: Battery Technology
Topic: Looking at building a new pack with Samsung 50E
Replies: 35
Views: 2945

Re: Looking at building a new pack with Samsung 50E

Ok, so after going back and forth between 40T and 50E I built my battery with the 50E because of the cycle life rating of >80% after 500 cycles. The 40T had same rating as 30Q which is what my current pack used. 40T has signifiantly lower DCIR than 30Q. ("LG" 10sec 0.5C load DCIR test method at 50%...
by Pajda
Jul 21 2019 4:45am
Forum: Battery Technology
Topic: Looking at building a new pack with Samsung 50E
Replies: 35
Views: 2945

Re: Looking at building a new pack with Samsung 50E

Did you have the chance to test Sanyo NCR2070C 20700 3500mAh - 30A? I have a 6p 30q pack that sees 90A currents and start to get unbalanced. I need a new set of cells and looking at sanyos or 40Ts. I am after the most light weight pack so I do not want to add a lot of cells in P. 18Ah is plenty fin...
by Pajda
Jul 17 2019 3:00pm
Forum: Battery Technology
Topic: Looking at building a new pack with Samsung 50E
Replies: 35
Views: 2945

Re: Looking at building a new pack with Samsung 50E

... I am more focused on LG INR21700H40 as a direct (and slightly cheaper) comepetitor to Samsung 40T. That should be an interesting cell. Have you found any datasheet's or discharge graphs for that cell? What price did you see for the H40? No I did not already find any datasheet or graphs of LG IN...