Is that particularly bad? in the real world, and in more simple terms, how does that effect the battery? Also is it known that something like the xtar vc4 doesn't do that? I have watched many reviews particularly of the nitecore d4 the xtar vc4 and the opus bt-c3100 and I haven't seen anyone test for that other than the on opus one.
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Again, you may be over thinking this.
A charger should charge a battery at a suitable rate without ever over charging it.
Most decent chargers on the market will do this.
Efest, Nitecore, Xtar all make good chargers which is a step above decent.
No matter which one you pick, none of them will make any noticeable difference to the average person or the average battery.
Battery life span using any of them will be within a few charge cycles of each other.
Just me, I don't like the PWM of the opus because the high peaks of the pulses are slightly more aggressive almost imperceptibly harsher on the battery than what I like to see.
The only time I've had any concern with the opus is when Ive taken a battery out of a device and put it on the charger with no rest period between use & charge. Meaning the battery was slightly warm / above ambient temp when placed in the charger.
Those few batteries did heat above anything I'm comfortable with while charging, enough so that I removed them let them rest until cool then stuck them right back in the same charger.
There is nothing wrong with the opus unless you like to split hairs or pick nits.
I prefer other chargers over the opus, but I own one and use it occasionally.
