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hello need advice to test my cells 18650
#1
good evening everyone I want to start my first battery. I recovered 3000 used batteries, and I bought 3 opus bct3100 chargers. So I want advice to guide me in testing cells with the opus bct3100 charger. What do I need to know about the cells, when they are good or bad, if there is a special configuration for the opus bct3100 charger. any help and advice to help me sort out the correct batteries is welcome thank .you
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#2
Test the cells on the charge test. separate the cells by 50-100 mAh ranges as they finish the test. To test efficently use a couple non testing chargers to precharge the cells and to post charge the cells. Get a good IR tester. Read wolf , offgridinthecity, there are a few others that are excellent at explaining things.
later floyd
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#3
Take a look at the Cell Database to compare current state of health (SOH) with what they'd be new. If less than 80% life is left, not really worth it, imho. Not for powerwall-like applications anyways. Individually they'd be fine, tho.
Proceed with caution. Knowledge is Power! Literally! Cool 
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#4
like they mention get an IR tester cost about 50 dollars, best money I spend. It will quickly test a cell so you don't have to waste your time. Some cells test good on the opus but have high IR (in the 100's) which will later give you problems. Its the first thing I do before they go in the opus.

Its easy to use, if you test 100 cells of the same brand and they are all in the 60 milliohm range, but 1 or 2 is in the 80 milliohm, I set aside the high IR ones. Different brand of cells have different range of IR, after testing a couple you can spot the bad ones. The high IR cells might not be all that bad, but it would not be a good idea to use in a powerwall.

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#5
@jonyjoe505 what tester is that in the picture ?
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#6
(07-23-2020, 09:15 AM)Overmind Wrote: @jonyjoe505 what tester is that in the picture ?

Looks like a YR1030
**************************************************************
Based in Panama

Off-Grid
PV = 3 x 200W
Bat = GEL 250Ah
Feeding Fans / CCTV / Modem-Router / Android Boxes

Going on-grid
** 345 ** batteries harvested / getting GTILv2 2Kw auto sense 45-20V 240V
Lots of items coming from china - usa

...Updating as progress flow...
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#7
thank you all for your help, now i would like to know which mode i should use on the opus charger to test my cells and charging current. I also have another 16 slots battery charger, can I recharge all the cells before testing them in opus.
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#8
charge test 1000mA is standard weeds out weak cells that tend to be heaters.
The FAQs are a good read.
later floyd
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#9
(07-23-2020, 09:15 AM)Overmind Wrote: @jonyjoe505 what tester is that in the picture ?

Thats a Vapacell (YR1030) i got one to works very well
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#10
hi everyone, i have started my 18650 cell tests and currently i have cells between 1000mAh to 2000mAh AND 2000mAh to 3000mAh -3000mAh to 3900mAH, i need your advice which cells should i keep?I noticed that the test lasts too 5 hours for some cells, is it normal?  thank you.
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