[Q] Li-Ion Battery showing 4.3 voltage topic

I have flashed and restore my tab many times, mostly stocks recoveries, but now when i charge my tablet turned on i have noticed that when its 100% charged it shows a voltage of 4.3, also if i charge my tablet turned off and then i turn it on battery shows 95%, and takes around 15-20 minutes to get to 100 and also shows 4.3v. I have been reading about the average voltage of Li ion battery's and the recommended is 4.2v, or it battery capacity or lifespan decreases. I didnt check the voltage before so i dont know if it is normal, im using stock charger. Im afraid of overcharging the so suffered Nvidia Battery. Does anyone has 4.3 voltage at full charge?