I’vce been using the Miboxer C8 for about a month now, so far so good. It’s idiotproof, its got only 2 buttons, it does everything for you out of the box, you can easilly configure current if you want, it seems to work like it should whetehr its 10180 or 26650 or Eneloop AA’s. I had tons of chargers over the years, this one seems fine.
Nothing under $50 is going to have adjustable termination voltage. A few chargers will do multiple chemistries so you can charge under and over 4.2v by setting that.
There is a hidden switch on the underside of the Opus you can access if you cut a hole in the case bottom. That will allow you to change that one.
Based on your recommendations, and further reviews of the chargers you’ve recommended, I’ve decided to go with the MiBOXER C4 or some variation thereof.
I needed a charger to do the longer 21700 cells and I went with the Miboxer C4-Upgrade. One amp for all 4 bays, or 1.5A for two bays is adequate for me. I’ve been happy with it. I like that it has the option for 12v with a standard 5.5 x 2.5mm jack or can plug in an AC cord. The Miboxer Upgrade C4-12 only has 12v input which is fine by me too. I use a 12v power supply that can source more current than most wall transformers. Nice to be able to use in the car.
For discharge capacity testing, I have a dedicated capacity tester (a ZHIYU) and didn’t need it built into the charger. (but seldom find a need to use it anyway). The new Miboxer Upgrade C4-12 (now has two yellow buttons) wasn’t available when I got my C4-Upgrade. Still waiting for it to become available on Amazon.
All my chargers have slightly different termination voltages. I prefer the ones that terminate a little under 4.20v, but some terminate higher. It won’t damage the cells, but you’ll get maybe 10% less cycles from them. You’ll also get a bit more capacity out of them, though probably only 1% - 2%.
My Xtar X4 terminates around 4.18v. So, I don’t think Xtar is designing chargers to terminate high. It’s just the random variance in the chips that all companies use.
I think my next charger will be the SkyRC MC3000, because you can set the termination voltage to whatever you want.