Hello BLF’ers,
The last cells I bought were in 2013 and they were ncr18650b.
I want big watt hour cells for power banks only. Therefore only looking at 3A draw Max.
Also reliable cells that can take 100-200 cycles easily and not lose too much capacity.
Cost is not a huge concern just want proven good quality cells.
Please advise. Thanks!
The ones you bought in 2013 are probably still best for capacity/runtime.
The only cycle testing comparing several commonly available cells I’ve seen are in this thread by Docware : https://endless-sphere.com/forums/viewtopic.php?f=14&t=103092&start=425#p1558437
Pajda also started publishing tests further in the thread. (Both are also user here).
LG MJ1, M36, Samsung 50E and 29E7 come out on top, discharge current is 2.5/3.75A for 18650/21700, and this is a partial discharge test , 4.1-3.4V.
Pajda just created a new thread with a bunch of 1k cycle test data at 5C disharge and 100% SOC and DOD.
After reviewing both of those threads, I’ll say that the cycle life and storage life characteristics of modern cells are better than expected.
Hmm. 40T looks like a really good cell in Pajda’s tests. 50S shows it’s weakness in CL.
Thanks for all the suggestions, guys.
Yes, the Panasonics served me well but are looking a little run down now.
Possibly a newbish question…
I want to build around 10 power banks (not for resale) but for use in a project.
Would like to keep costs reasonable but performance up as much possible.
Do Xiaomi or Romoss produce quality power banks and to just buy ready bought, instead if diy?
Do they generally use quality lipoly/lion cells?
Probably a question for the other forum…
The highest capacity 18650 cells are the Tesla NCR18650T1 cells from Vapcell
Thanks but the NCR18650T1 seems hard to find locally.
Front runner is the 35e
The INR21700-48X has a cycle life of 3000 to 70%.
These PowerADD power banks are testing out very well —- Hard to beat these prices with DIY or anything — Some guys even pulled the 21700s out of the big pack
https://www.amazon.com/gp/product/B09MD8ZB9Y/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&th=1
https://www.amazon.com/gp/product/B09LQQ3CYK/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
Damn, i wish i had some of those.