Opus Ct-3100 discharge stops at 3.5-3.7 volts

My Opus has been diligently working for the past couple of months.
Now in the 800's completed capacity checks. it's randomly stopping discharge at 3.5 to 3.7 volts.
Sometimes, I can unplug the power and then it will begin discharging again.


Any suggestions?

Do all of the slots stop at the same time, or is it just one of them? Is the fan working? Does it feel like it's getting hot?

mike said:

Do all of the slots stop at the same time, or is it just one of them? Is the fan working? Does it feel like it's getting hot?

Click to expand...

All slots stop. It is not hot. I have a PC fan on top of it to increase airflow. It has been running non-stop for weeks with no issues.

Seedser said:

mike said:

Do all of the slots stop at the same time, or is it just one of them? Is the fan working? Does it feel like it's getting hot?

Click to expand...

All slots stop. It is not hot. I have a PC fan on top of it to increase airflow. It has been running non-stop for weeks with no issues.

Click to expand...

I have not tried this but supposedly there is a switch inside to select upper cutoff of 4.2 or 3.7v ... open the back and flip the switch?

ehch-tee-tee-pee-ess qolon slash-slash www.e-cigarette-forum.com/forum/threads/opus-bt-bt-c3100-v2-2-question.758925/

(sorry first post so I cannot post a linky)

Cheers!

EDIT, sorry just re-read your post ... on a discharge test it is stopping randomly at 3.5-3.7 volts? I have experienced this but only with cells I had a starting voltage of below a volt which I bump-charged and then put on the OPUS. I found I had to re-seat them a few times before I got a good discharge test.

I'm having the same issue. It's been working fine for over a month but recently stops discharging at 3.5 to 3.8V. It's definitely done discharging. It's been powered up this whole time, so I just unplugged it and will let it sit for a while an try again.

*edit* it's happened on cells that started at 3.0+ volts. Fully charging, discharging, then repeating that the same day gave the same results.

Is it discharging at 3.5V under no load, or 3.5V under load?
If it's the first one, what is the A drain? They might be draining to very low voltages.
Otherwise, there may be a problem with it.

This morning I finished charging and discharging four known good batteries with the Opus. Each started at ~4.18V, ended at 3.20V to 3.3V and each have roughly the same capacity as the last time I tested them. Gonna do some more testing; maybe put a known good battery in with the weird ones and see how that goes.