The maximum voltage is 8.40V, I sent A LOT of people to discharge their cells a bit before I'd let them on track at the Kidderminster national.
Almost all of them were using the Core RC chargers (seemed to be the least accurate for some reason).
I have had this issue myself with the Etronix charger and it turned out to be the 2mm socket on my balance lead going a little high resistance. I choped it off and put a new one on and the problem went away (hopefully for good).
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