Fully charged @ 4.12v, is this normal?

[F250XLT]

I received a few Redilast 3100mAh 18650's yesterday, and topped them off right away. I charged 2 of them in my Pila, and the other one on my Triton. None of the three were actually 4.2v when they came off came off, 2 are now 4.12, and the other is 4.16. The Triton was reading 4.2 when I took it off, but that was obviously not right. Is this normal, is 4.12-4.16 fully charged?


Another question is.....What is the purpose of discharging cells with the Triton, is it for conditioning them? Can you check the actual capacity of an old cell that way?

 

[HKJ]

I received a few Redilast 3100mAh 18650's yesterday, and topped them off right away. I charged 2 of them in my Pila, and the other one on my Triton. None of the three were actually 4.2v when they came off came off, 2 are now 4.12, and the other is 4.16. The Triton was reading 4.2 when I took it off, but that was obviously not right. Is this normal, is 4.12-4.16 fully charged?

That is normal, look at the curve below. I stop the charge at the yellow line and immediately the voltage drops (red line). How much it drops will depend on a number of factors, some of them are charge terminating current and battery age. A hobby charger will often have a charger termination current of 1/10 the charger current, i.e. if you charge at 1A the termination current will be 0.1A. Charger at 0.1A and the termination current will be 0.01A.

Another question is.....What is the purpose of discharging cells with the Triton, is it for conditioning them? Can you check the actual capacity of an old cell that way?

No conditioning, it is for testing the actual capacity.

 

[F250XLT]

Thank you for the info, much appreciated.