4.25V for charging is quite normal, so other than standardizing end voltage and increase battery endurance per OP wish, other members with regular charging use might not need to do this procedure.
Just my viewpoint, this mod slows down charging a bit and leave you with less charge capacity (and of course in doing so increase battery lifespan).
You can also use this fix for the 4.35V position if you only have 4.30V cells. Remember that all voltages are changed by the same percentage.
It seems to be a good charger. I just miss lower charge currents. 0.5A is not really good for many batteries. I can only think of 18500, but for 14500 and smaller, I want 0,25A or lower.
Have you checked what those changes do to the NiMN charging behavior?
With an unmodified one, AAA NiMH cells get warm on the 0.5A setting.
I have no clue what method this charger is using charge NiMH cells though.
I think it is quite normal that AAA NiMH get warm at 0.5A.
I just made myself a mod with 50/100 mA charge current for charging some incoming 10180. I have no intention of using that unit for charging NiMH. Let's see what HKJ finds out about the NiMH charging method and we can act accordingly.
Yes, that will also do it, but it takes two solder irons and a lot of skill to unsolder R6 and get it fast away from the tip of either iron in healthy state (and find it afterwards ). But at least the board has a better support by this procedure.
I tried to charge a half full Eneloop XX, size AAA with 200mA in a unit modded for 200/400 mA. Happy to see that the charging stopped. Max voltage was 1.559V and cell voltage right after was 1.45V. The cell did not get warm.
+ 1. This was my point in asking if the 4.25v was the voltage taken during the Charging process, not after from the cell’s voltage after taken off the charger after “Done”.