Second unit came, terminates at 4.13V. That appears to be the norm.
I stopped using the internal charger for another reason, it takes considerable force to yank the charger cord out and I got a feeling its going to be short lived if I charge the batteries every week or so. I have ripped out USB sockets while they are still attached to the cord. Both of my CL25Rs now run higher capacity 3100mAH Eagletac protected cells.
Anyone want the stock 2300mAH 18650s? I have no use for them because none of my lights can run flat top cells.
Edit: PM replied, taken