Begginers Guide to Processing 18650 Cells | Cell Database


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Bad OPUS Charger?
#1
Hello,

Has anyone had issues with the OPUS BT-C3100 charger not charging to 4.2v? I'm using one I bought from Amazon, I don't think it is charging correctly. The OPUS displays "FULL" after several hours charging, but when I take the battery out and use a volt meter it reads around 4.14. I get the same reading on three volt meters. Then if I put the battery back in the OPUS it will display "4.19" then switch to "FULL".

Maybe I just need a good quality volt meter. Dodgy
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#2
Yes, that is a common issue with the opus chargers.

Another thing is it's possible your MM could use a bit of calibration. Depending on the type, there could 1 adjustment, or as many as 4. I just calibrated my 3 cheapo's to read the same based on a known voltage. So everything reads the same.
As long as everything is on par with each other, the readings of the opus isn't quite that big of a deal. You can keep track of the cells performance just the same. If your MM shows .5V drop over X time, it doesn't matter whether it's 4.2V - 3.7V, or 4.15V - 4.0V.
hbpowerwall likes this post
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Dollar Shave Club. Best Razor I've ever used
Certified 18650 Cell Reclamation Technician
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#3
Yeap normal. They can be all between 4.15 to 4.25.... Yes its not that good but as most of us just use them to do a test it will most likely work. Just make sure you know of the ones going above 4.2
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#4
I had one that went to 4.34 volts I managed to get in in the bin basketball style on the third attempt
http://www.hbpowerwall.com for a full video diary of my project.... 
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#5
Yep the opus is a good DIScharger.
I mainly use the digital 4s imax with 8 slot tray and nitecore i4 to charge
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#6
Hello,

I have the same charging result! This morning I got the same problem on all of my 8 opus chargers. Now the cells are 'fully' charge my multimeter measures 4.15v. Normally I pull them out let them rest for a day and put them back and charging at 200Mah. This morning I disconnect all the opus from power and put them back after 10 min. 

Fingers crossedWink

What can help it to discharge the cell for a few seconds with a car lightbulb and put it back.
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#7
Note that after charging to 4.2V its normal that they drop to 4.15 or around... Also note that you do not get much more into them so for testing purposes it doesnt give you much in long run.

Note that you charge in A or mA. Not mAh or Ah. And most likely not MAh that is Mega Smile
SimonW, Korishan, owitte like this post
Follow me! >> YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcomming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#8
Yeah it's not such a big deal, do wish they would fully charge but overall they seem good. For the price can't really complain
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#9
yep, that's normal for these cells. Keep in mind that nominal voltage is 3.7V, 4.2V is charging cut-off voltage, which means that the charger stops charging as soon as the cell reaches this level. It doesn't mean that cells stay there...

permanently on battery from:
- 2017/05/20 - 2017/07/01
- 2017/07/02 - 2017/07/25
- 2017/07/26 - 2017/08/16
-  2017/08/17 . ?
What's left:
my current grid consumption
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#10
Here's an over simplification of the battery voltage charging. It's kinda like an egg. As you approach the tops and bottoms the voltage will move rapidly (fill up or drain)



So when you get to 4.2V, it'll drop to 4.15V relatively quickly. However, charging to 4.2V is like going up a steep hill from 4.15V.  And when you get to about 3.2V, the voltage will start to rapidly drop as the voltage is drained. that is one of the main reasons why 'not' to drain the voltage to 3.2V; 3.4V is way safer.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Dollar Shave Club. Best Razor I've ever used
Certified 18650 Cell Reclamation Technician
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