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Best way to discharge to 3.7 Volts?
#1
Hi everybody,

just started to build my own small battery with 18650.

I startet to test some cells voltage drop after 1 month. After finishing the voltage drop test i want to ask how you discharge all 18650s to 3.7 or 3.6 for storage or building the packs?

I noticed that you can change settings on an opus charger to 3.7volts. But for this you have to discharge the cell complete an load them again. I guess somebody has a good idea to get them better to 3.7 or 3.6 volts.

Thanks!

regards Christian
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#2
Quite easy.
Build yourself a 20p (or however many cells you want to put in parallel) discharge board.
Get a ZHIYU® ZB206 and set it to discharge to 3.6V at whatever amperage you want and you are done. Bonus is it will tell you how many Ahs you have discharged.
You can also use an iCharger to do the same just more expensive.

I'm sure there are other ways but this is the easiest way I have found.

Wolf
bogptrsn and BlueSwordM like this post
If 18 X 650 = 2200+mAh then we have power! 
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#3
Oh cool. I wanted to do the same thing, but I had spare time on my OPUS, so was just using it to discharge. Curious to see hear what others are doing.
Mobilis in Mobili

 
Cell count as of 8/14/2019
106 Cells >2000mAh, >80% Rem. Cap., 14 day resting voltage >4.12V
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#4
After discharge to 2.8v with the zb2l3 to get the capacity, i charge them back up with a cc/cv converter to 3.45 volts
Still learning English. Learning Li ion and solar technology.

2800 cells in packs Exclamation above 2500mah and 90%soh.
~400 cells between 1800-2500 and above 90%soh(sell?)
600 cells between 2200 - 3000mah, 80-90%soh (sell?)
3000 waiting for testing.
approx: 0 cells not safe for use: dead, heaters, to high ir or sd/vamps

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
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#5
I dont. I build en as is....
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#6


Still learning English. Learning Li ion and solar technology.

2800 cells in packs Exclamation above 2500mah and 90%soh.
~400 cells between 1800-2500 and above 90%soh(sell?)
600 cells between 2200 - 3000mah, 80-90%soh (sell?)
3000 waiting for testing.
approx: 0 cells not safe for use: dead, heaters, to high ir or sd/vamps

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
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