Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
spreadsheet for cell info?
#11
its a bit weird, been testing some sanyos, original capacity 2500, im getting tested 2596ma, 2664ma why is this?

thanks interesting
Battery is li iron using 18650s, 14s, 0p, and growing cell so far 300, untesteded.
Bms is a diy open source by stuartpittaway.
No solar yet, 
Building wind turbine, 48v im after a 48v motor if anybody has one for sale.
Cells 2000 to 2500ma.
Cells 1500 to 2000ma.
Cells 1000 to 1500ma.
Reply
#12
Because it's possible a cell can be better than spec'd. It's also possible that your tester is misreading. Are you testing via discharge or charge? If testing during charge, the tester is including current that is being wasted as heat.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)
Reply
#13
(09-16-2019, 09:23 PM)Jonisingt35r Wrote: its a bit weird, been testing some sanyos, original capacity 2500, im getting tested 2596ma, 2664ma why is this?
Jonisingt35r,

No not weird at all.

It all depends on the battery condition and the charger/tester you are using.
If you have a Sanyo UR18650F and the IR is <50mΩ  then these readings can certainly be seen.
If you are using an Opus, LiitoKala or god forbid a Zanflare then your readings will be inflated by 2% to 3% on Opus, 5% on the LiitoKala and 10% on the Zanflare.
Also if it is a UR18650F then the spec for its typical capacity is 2600mAh.


I do not have any UR18650F cells but have tested and recorded 641 UR18650FMs with similar specs and out of those 44 cells where over 100% of nominal. So no not weird at all.
Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
            Cool
Reply
#14
(09-16-2019, 09:23 PM)Jonisingt35r Wrote: its a bit weird, been testing some sanyos, original capacity 2500, im getting tested 2596ma, 2664ma why is this?

thanks interesting

I have seen this on cells that have also have higher IR.  What I have noticed is that the discharger will discharge below 3v.
I still record the results but will filter them out for further testing.  Most likely will use them in an LED flashlight application only.

They will cause the pack to have an imbalance.
Reply
#15
Not sure if it helps anyone, but I've been serializing my cells by a 3-alphanumeric identifier (36^3 = 46.6k cells, more than I'd ever use). I draw a line under characters, and no line for digits. I also still write the capacity and IR on each cell, so if something gets smudged it's easy enough to uniquely identify the cell.

Example:
Reply


Who read this thread?
37 User(s) read this thread:
hbpowerwall (09-13-2019, 11:09 PM), rewyred (09-21-2019, 09:24 AM), kevinjaye (09-13-2019, 04:40 PM), OffGridInTheCity (09-13-2019, 03:53 PM), intra (09-27-2019, 07:37 AM), winny (10-12-2019, 02:03 PM), ben teker (09-15-2019, 08:04 PM), Marrcin (09-24-2019, 09:41 PM), Nemo (09-18-2019, 02:37 PM), Jarry (10-04-2019, 05:11 AM), Jonisingt35r (09-28-2019, 07:05 AM), rakso (09-15-2019, 08:01 PM), Rabbithacker921 (09-18-2019, 07:47 PM), Eduardo Kang (09-13-2019, 04:27 PM), iNeedMoarProtection! (09-15-2019, 09:05 PM), BatteryMooch (09-27-2019, 11:46 AM), nick81 (10-10-2019, 12:46 PM), Wolf (09-27-2019, 11:28 AM), clupton (09-16-2019, 06:45 PM), Beholder (09-27-2019, 09:11 PM), daromer (09-16-2019, 03:52 PM), owitte (09-13-2019, 07:59 AM), Korishan (09-17-2019, 04:42 PM), jdeadman (09-27-2019, 12:56 AM), The-J-Man (09-14-2019, 11:18 AM), Geek (09-30-2019, 02:37 AM), SWEwall (09-13-2019, 07:08 PM), ChrisD5710 (09-17-2019, 08:57 AM), Oz18650 (09-27-2019, 02:37 AM), rev0 (09-26-2019, 10:28 PM), completelycharged (09-12-2019, 08:41 PM), Ibiza (09-27-2019, 03:03 AM), Bubba (09-27-2019, 01:38 AM), Riplash (09-18-2019, 01:33 AM), HikingGuy42 (10-09-2019, 02:22 AM), chuckp (09-17-2019, 09:39 PM), Pilotfromdk (10-14-2019, 07:06 PM)

Forum Jump:


Users browsing this thread: 1 Guest(s)