I just randomly checked some of my newer batteries in other sized and got 4.O on them. But I don't remember when I last charged them. Have them in use now so I can recharge them and see what I get.
That is probably a really good idea. You need to get a handle on what that charger is doing. What voltage it stops charging at. I suggest you start from scratch with batteries that are below 3.9V, charge them and see what voltage you get off the charger. If you start with a battery at 4V or above the charger might not actually start charging it.
Let us know what you get and we'll move forward from there
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