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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! 
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
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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 10/10/2019
234 Cells >2000mAh, >80% Rem. Cap., 14 day resting voltage >4.12V
191 Cells of Everything Else
68 In progress
 
Aiming for 8 cells tested a day
More info on my Google Drive
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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.

4200 cells in packs Exclamation above 2500mah and 90%soh.
1500 waiting for testing.

Saving for 3 times phoenix inverter 48/3000 230v to gain also 380v
3 chargers?

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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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
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#6


Still learning English. Learning Li ion and solar technology.

4200 cells in packs Exclamation above 2500mah and 90%soh.
1500 waiting for testing.

Saving for 3 times phoenix inverter 48/3000 230v to gain also 380v
3 chargers?

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