Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
"Generic" Cells - Are they any good?
#61
Congratulations to Generic for the testing and sharing the results.
I know that this takes a lot of commitment to do manually.
I am only at 140 tests between 2 cells, and while each test is fairly quick, it still adds up.

(09-10-2019, 10:18 PM)rev0 Wrote: Wow, you did all these cycles manually? If you're interested in continuing this sort of testing I could send you an 18650 cycle tester I've been working on (would be an older version of which I have several), details are here: http://rev0.net/index.php?title=CCR It sure seems easier than manually restarting a cycle on these cells and taking down the data.

That is a lovely offer.
It is nice to see someone else supporting generics testing and contributions to the community. I offered to provide an opus tester earlier on, so his device is not tied up.

I have had a quick look at your project and this looks very interesting to me as I also would like to do some repeated testing of cells.

I have started already with a single zb206 and tp4056 and have done 140 tests across 2 cells, so only 70 cycles for each cell.
I do have a bunch of questions that would be answered by being able to automate this testing. From the manual testing I have already done, I have determined that it would really not be feasible for me to do without automation.

I have many cells that are exactly the same type, and the packs have date codes.

I would like to observe how cells behave over many cycles where
-cells are different ages based on manufacture date
-cells that have had very little use
-cells that have had lots of use
-cells have been at zero volts and recovered
-1A charge and discharge
-0.5A charge and discharge
-reduced voltage range

I believe low use vs lots of use could be reasonably estimated based on the state of the packs and devices my cells come from.

I think the 1A vs 0.5A comparison would be a nice contribution to the second life storage community.
In theory the reduced currents and voltage range extend cell life, but being able to show the size of the effect in real life would be great.
Reply
#62
Oz -Well, the newest Samsungs that Thunderheart has been reviewing quote cycle life to 70%, so I think the actual percentage is a bit arbitrary. After 70 cycles on each cell, are you seeing any degradation?

rev0 - Wow, you've done some very interesting research! Another member mentioned about the ReVolt cells only getting 340 cycles before nosediving, and I couldn't find the results until I clicked your link! I may be interested in your offer, I'll send you a PM.
Formerly known as Dallski
Reply
#63
(09-11-2019, 05:32 AM)Generic Wrote: After 70 cycles on each cell, are you seeing any degradation?

I don't think I have seen any degradation yet, certainly not that I can spot without analysis of the results.
I just got the lowest result yet, but also the highest result yet a couple of days ago.
Reply
#64
(01-31-2019, 01:02 PM)Overmind Wrote: I agree with Dallski here, these home testers are good enough for general use but not good enough for professional use.

If I cannot set the exact discharge max current and the minimum voltage specified by the manufacturer, the test is not professionally relevant. Also, none of the testers I have encountered support high discharge currents. That makes most of the tests of high power cells irrelevant. They will test fine at 1A discharge and instant die at 10 or 20A.
I'm going to use the Charge Test function at 1000mAh and record the capacity for each of the cells after each cycle. These will all be full cycle 4.2V to 2.8V discharges, so it's a lot more abuse than a typical powerwall will give these cells, but it will also help speed up the results. I'm going to aim for at least 100 full cycles.
Reply


Who read this thread?
100 User(s) read this thread:
hbpowerwall (07-23-2019, 08:34 PM), daromer (06-24-2019, 06:21 AM), Sean (07-21-2019, 08:14 PM), mike (Yesterday, 10:40 AM), Majorphill (09-09-2019, 05:00 AM), Korishan (09-15-2019, 11:35 PM), A + A (09-09-2019, 02:34 PM), PAF (08-11-2019, 11:03 AM), brettwatty (07-29-2019, 02:09 AM), ozz93666 (06-27-2019, 09:38 AM), jdeadman (Yesterday, 02:08 AM), wim (07-01-2019, 09:10 AM), melsom (04-14-2019, 09:56 PM), The-J-Man (01-31-2019, 04:02 PM), watts-on (07-01-2019, 07:34 AM), Jack Daniels (08-31-2019, 08:00 PM), Gimpy_AK (07-20-2019, 05:51 PM), Stefaan De Ridder (07-01-2019, 12:14 PM), Chiptosser (03-09-2019, 02:49 PM), BlueSwordM (07-01-2019, 03:36 PM), Mazlem (09-10-2019, 10:48 PM), Geek (Yesterday, 04:36 AM), Ivo Staelens (08-04-2019, 09:19 AM), mr_hypno (02-07-2019, 10:13 PM), Herbi (06-24-2019, 10:47 AM), Grumplestiltskin (01-28-2019, 08:31 PM), Oz18650 (Yesterday, 04:45 AM), rev0 (Yesterday, 05:41 PM), CarelHassink (01-29-2019, 10:24 PM), karmi27 (02-08-2019, 06:47 PM), cnous3 (07-21-2019, 09:42 AM), djuro (08-05-2019, 04:06 PM), uploader18 (04-03-2019, 06:17 AM), jm1 (08-20-2019, 02:14 AM), drchips (01-28-2019, 05:04 PM), benwilliam (08-15-2019, 02:58 PM), Drokz (06-05-2019, 07:18 PM), NGPowerwall (01-28-2019, 02:09 PM), Chablis_m (09-10-2019, 03:44 AM), Headrc (07-01-2019, 02:47 PM), Crimp Daddy (09-11-2019, 12:19 AM), jonyjoe505 (03-10-2019, 11:52 PM), Ibiza (09-15-2019, 11:34 PM), Krokodino (06-25-2019, 01:13 PM), Zvonko000 (04-16-2019, 06:49 PM), Oliman (06-05-2019, 06:56 AM), thunderheart (06-24-2019, 08:32 AM), SilverNodashi (03-14-2019, 07:18 PM), conejoblanco (07-28-2019, 06:31 AM), Bubba (09-11-2019, 10:16 AM), Cherry67 (04-17-2019, 03:21 PM), Walde (01-31-2019, 07:43 AM), Unleashed (03-13-2019, 02:07 PM), Riplash (09-11-2019, 03:54 AM), 100fuegos (07-20-2019, 05:02 PM), Jim Jr. (06-26-2019, 10:12 AM), bukvaahmed@gmail.com (03-11-2019, 06:12 PM), w0067814 (01-28-2019, 08:18 PM), Sammm (03-09-2019, 08:46 AM), AcE Krystal (07-19-2019, 10:49 PM), chuckp (09-15-2019, 10:03 PM), rgr (08-05-2019, 06:01 PM), MGPTWEGB (02-09-2019, 11:05 PM), WuggyBuggy (06-23-2019, 06:51 AM), emuland-metroman (06-26-2019, 07:39 AM), hazSolar (02-26-2019, 02:58 AM), Truth (04-17-2019, 05:36 AM), runsnbunsn (01-28-2019, 06:12 PM), Shawndoe (04-16-2019, 03:41 PM), Wolf (Yesterday, 12:00 PM), Bastler_Ro (06-26-2019, 08:15 AM), Lekr (05-16-2019, 07:43 PM), Scottietheyoung (09-10-2019, 10:22 AM), ibikunle (07-01-2019, 09:11 AM), camthecam (03-10-2019, 11:45 PM), Generic (09-11-2019, 05:32 AM), rettore (05-24-2019, 07:44 PM), Solardad (05-03-2019, 02:02 PM), Speicher (03-11-2019, 09:01 PM), stevelectric (09-15-2019, 10:35 PM), BigDav (03-01-2019, 04:57 PM), veter (06-29-2019, 05:57 AM), ajw22 (08-11-2019, 03:24 AM), BmoreThor (02-10-2019, 01:45 AM), kevinjaye (09-11-2019, 03:33 AM), OffGridInTheCity (09-14-2019, 11:56 PM), Maniac_Powerwall (01-28-2019, 12:49 PM), LEDSchlucker (07-17-2019, 07:25 PM), barns (08-04-2019, 10:02 AM), bchur83 (03-09-2019, 02:23 PM), Satiriasis (03-12-2019, 04:53 PM), sparkgap (01-29-2019, 09:37 AM), fannel (05-13-2019, 11:41 PM), Gremlin (05-07-2019, 10:43 PM), Richard (02-07-2019, 10:37 PM), bertvaneyken (05-03-2019, 08:44 PM), Legolfeur95 (02-08-2019, 07:14 AM), Zambuk (02-09-2019, 06:54 PM), Iker138 (03-29-2019, 08:37 AM), Overmind (07-01-2019, 07:28 AM)

Forum Jump:


Users browsing this thread: 2 Guest(s)