Just went and checked the cells in my Opus BT-C3100. 2 of them were at 4.47 volts. I pulled them out. They were not warm. I was shocked so I didn’t get to see the charge current.
Cell 1 was brown LG HG2 with less then 25 charges.
Cell 2 was a Nitecore 18350 IMR with over 100 charges.
I inserted some laptop pulls that had been laying there. 1 was 4.39 volts. The others were 4.15-4.18 (what I usually get)
I filled it with cells to see it over charges again. I am running the cells in lights to burn off some of the voltage.
This has been a great charger. I have used it much over the last year.
What do you think?
Anyone have this happen?
Time for a new charger?
If you take it apart there is a small dip switch with 4.3 volt and 3.6 volt setting, if some how that got jarred into the wrong position it would explain some of the overcharge, but not all the way to 4.47 volt.
Also maybe clean the contacts well with an electrical cleaner. Strange for the thing to go whack like that.
HTH
I’m getting some issues with mine all of a sudden. I’ve had mine few months and it’s been used maybe a dozen times. First I was noticing the fan would come on right away and had a burning smell, like a wire overheating. Bay 2 would show “charging” with no cell in it. Bay would would start at 500mah charging then slowly drop to 5mah. Cells in bays 1 and 2 would get extremely hot. Brand new 30Q’s. Bays 3 and 4 totally fine. Used it the other day and all bays are fine. No clue. No more smell. Cells charge perfectly. Didn’t try discharge mode but charging is fine. Glad I have a nitecore just in case.
Thinking mine is almost 2 years old. It has been plugged in next to the TV for close to a year, if my memory serves me right.
I don’t remember it ever getting banged or jarred.
I will try to clean the contacts before I test it again. The cells were not even warm. Felt same as the cells setting next to the charger.
For some reason I think they should of been hot at 4.47 volts, the current must of been low…….
I always clean the contacts, and the anode/katode of the batteries, before any charging operation. Nothing elaborate, just with a dry clean cloth. To remove grease and dirt that might prevent proper charging. Call me OCD, but I also give the slider a stretch or two, and rotate the battery a bit back and forth after putting it in.
Post # 303 is a good starting point. I replaced my fan and my power supply 15 months ago. No issues anymore whatsoever with stoppages during discharge and resets at point of transition from charge to discharge which resulted in LOSS of All data.