cell mania 18650

[batteryGOLD]

Hi there, I'm trying to build a all cells database
For those who like to see many cells picture confusion see here

https://ibb.co/WPSLSS4

I'm doing some benchmarks for many cells to classify triple test 3A, 5A and 7A for each cell model to get capacity mAh , internal resistence and final temperature,.
Many bms cut at 3.0 so all tests range 4.2V to 3.0V discharge.

Have a nice day

 

[Hillhater]

Why ?...
There are several sites with this data already online..
EG.. https://lygte-info.dk/review/batteries2012/Common18650IndividualTest%20UK.html

 

[john61ct]

See previous threads

most recent
https://endless-sphere.com/forums/viewtopic.php?p=1516152#p1516152

 

[batteryGOLD]

Why ?...
There are several sites with this data already online..
EG.. https://lygte-info.dk/review/batteries2012/Common18650IndividualTest%20UK.html

Hi Sir, this website database is great useful but would you prefer to make your own research and experiments or you just prefer to read?

I do both reading and doing my own experiments plus research.

I random picked up LG MG1 and SAMSUNG 25R to compare data to web site values (all certified genuine cells ).
Website data LG MG1:
MG1 @7A up to 3V disch--> 2.5Ah
MG1 @5A up to 3V disch -->2,55Ah
"Calculated internal resistance 80mOhm"...

My data: #1 LG MG1
MG1 @ 7A up to 3V disch --> 2651mAh , IR 28,5mOhm , final disch temperature 60 Celsius
MG1 @ 5A up to 3V disch --> 2683mAh , IR 31,1mOhm , final disch temp 49 Celsius

extra data:
LG MG1 zero volts recovered cells from ebike:
disch @ 5A --> 2208 mAh , IR 33,2mOhm , final temp 50 Celsius
disch @ 3A -->2259 mAh , IR 35,9mOhm , final temp 39 Celsius

My data: #2 SAMSUNG 25R
Sansung 25R @ 3A -->2436mAh, IR 17,7mOhm , final temp 34Celsius
Samsung 25R @7A -->2428mAh , IR 17,7mOhm , final temp 48 Celsius
Samsung 25R @10A->2397mAh , IR 19,8mOhm, final temp 59 Celsius

extra data:
Samsung 25R zero volts recovered new cells:
disch @ 3A --> 2248mAh , IR 20,1mOhm , final temp 36Celsius

25R Website data from graphs:
25R @ 7A disch --> 1,75Ah ???
"IR calculated 36mOhm" real?
..

Maybe too many details, most don't care about all details.. but remember "Tha devil is at the details."

Quick conclusion from all this data:
- My results are a bit different from website results at those LG and Samsung cells (I didn't compared more..)
- Most BMS cut at 3V soo real useful discharge is up to 3.0V , less than this is just a few percentage bonus energy, but not recommend running cells lower than 3V (reduces number of cycles, less cell life, "chemical stress zone", plus more heat.. )
-Zero volts recovered cells maybe lost about 10% capacity (don't know if it gets more capacity after cycles..din't test it)
- My internal resistance values are near to datasheet values, soo maybe precise.. (for all electronics experts they know that internal resistance of a electronic component is a crucial must know value) Also internal resistance tells direct about health of used cell/battery & knowing if genuine new cells.
- The website is trustable and congratulations to those who build that but use it only as a data reference. Always do your own personal experiments to compare.


Have a nice time.

 

[batteryGOLD]

See previous threads

most recent
https://endless-sphere.com/forums/viewtopic.php?p=1516152#p1516152

Hi Sir, development takes time, plus dedication plus cash investment.

Did you sent any cash investment to help me and our company laboratory?

You know "No money no Funny, no Business"

For those interested investing at a expert battery production stage laboratory located at Portugal to export all over Europe please send PM

Have a nice day.

 

[john61ct]

Sorry, but I have no confidence in your description of your enterprise, do not by default trust people I don't know, nor even if I did, have "extra" funds to donate ("invest") anyway.

Just the fact you advocate "extending" the lifespan of worn out packs by paralleling with new ones, seems all whackadoodle to me.

But I keep an open mind, if I ever see anything new & interesting, or even sensible, in one of your posts, I will pay attention.

 

[batteryGOLD]

Cell mania is back with more pictures to inspire all

https://ibb.co/qrskWDR

I also do performance graphics.. and save all data from all cells and batteries for future reference. But most don't care about graphs and don't understand part of it.. the only needed data is final value capacity up to 3.0V , IR plus final temperature and record it. Keep it simple!

https://ibb.co/b5dDGHM

Sorry all tha mess at secondary laboratory..

I have also did some Onewheel XR batteries recover and new build for more capacity at main company laboratory.
Check some pictures

https://ibb.co/9YTR1Rv
https://ibb.co/Q9hgT3p
https://ibb.co/DkxZTZk

Some Pack rebuild data:
Original XR cells --> Samsung 30Q 2years old used @ Onewheel XR board.
Original Benchmark results:

Samsung 30Q used 2years old disch @ 3A --> 2518mAh , IR 18,4mOhm , final disch temp 37,5Celsius
Samsung 30Q used 2years old disch @ 5A --> 2418mAh , IR 21,5mOhm , final disch temp 45Celsius

Samsung 30Q NEW reference @ 5A disch --> 2764mAh , IR 17,8mOhm, final disch temp 41Celsius

I added more capacity cells to onewheel XR.

Replacement cells , Sanyo / Panasonic genuine new.
disch @ 3A --> 3187mAh , IR 30,5mOhm , Final disch temp 39Celsius
disch @ 5A --> 3183mAh , IR 30,3mOhm , Final disch temp 48,5Celsius


Final conclusions for this post:
- Too much work and dedication to write data to all cells (I used edding 3000 marker)
- Graphs are great and expert look.. but at the end U just need the final results up to a 3.0V discharge. Capacity, IR, and temperature for comparative purposes. thats all.
- Onewheel batteries replacement needs dedication to go from original 2518mAh to 3187mAh capacity increase. extra miles using genuine made in Japan Sanyo cells (Panasonic brand is same as Sanyo at battery development, but Sanyo production is at Japan and Panasonic is comercial version made at China mass production)
- The high capacity Sanyo/Panasonic cells have higher IR than Samsung 30Q they will produce more heat, but for this application is OK and under the 60Celsius (Some tests show that a 18650 can work fine up a very limit of 100Celsius.. but don't go more that 60Celsius, chemical stress zone )
- It is also said over tha web that cells run better at some higher temperature, for example 40Celsius. It will accelerate the chemical reactions Is this true? I din't tested yet

Warning: Careful with onewheel XR XT60 standard connections, this company reverse those, they use XT60 connector flat side "+" for minus black..
PS: Is there any web site that I could add pictures direct to post instead of a link??

Have a great weekend

 

[serious_sam]

Did you sent any cash investment to help me and our company laboratory?
For those interested investing at a expert battery production stage laboratory located at Portugal

Sound's legit... *SARCASM*

EDIT: Added *SARCASM*, since apparently it wasn't clear...

 

[batteryGOLD]

Did you sent any cash investment to help me and our company laboratory?
For those interested investing at a expert battery production stage laboratory located at Portugal

Sound's legit...

Hi, thanks for quick rplay post.
That picture was a 42V battery recovered from dead zero volts battery record with LG MG1 cell buses. 4P10S LG MG1 cells went put out 9,25Ah @ discharge 12A after revived and about 8mOhm IR (parallel of 4cells means average arround 32mOhm each cell recovered ). (don't know if capacity increase with cycles. not tested..)

Could you please tell me how to upload picture direct to post like U done?

Many thanks