@fvdk,
Li-ion cells are fully charged at 4.2V but most chargers will slightly undercharge to 4.1 - 4.19V
No, I'm not agree that not only from my experience long years.Anothers sources (many sources) said 4.3 v
I"ve croped this from Power stream site long time ago (have not link...sory):
If you read your own quoted message from the Power stream site, than you will see that it says exactly what I have told, you are misreading what is says.
When charging, the charger will first use a CC (constant current) stage until the charge voltage reaches 4.2V (at that time the cell is indeed charged to about 70% of it's capacity) however, it will than keep the voltage at 4.2V (+/- 0.05V) and switch to the CV (constant voltage) stage where the current will slowly drop until it reaches 3% of the cell capacity or until the current levels off and cannot go down further. This is the stage in which the cell will reach it's full charge.
With a proper designed charger, if you than take the cell of the charger and measure the voltage, you will see that it is at 4.2V or like I said, slightly lower if it is an older cell or a less well designed or conservative charger.
According to the specifications of all Li-ion manufacturers, the charge voltage should never exceed 4.2V (+/- 0.05V).
In battery packs (multiple cells) or cylindrical cells, a protection circuit is build-in or added which will kick-in if the voltage goes above 4.3V but mind you, this is an added protection to prevent explosion just in case the charges does go above 4.3V which a proper charger would never do.
If your charger constantly charges your cells to 4.3V than it does not follow a proper CC/CV algorithm and it probably does not cut-off like it is supposed to do. At best, it shortens the lifespan of your cells and in the worst case, it could overcharge your cells and cause them to explode.