8.40V maybe?

I still have a venom pro charger. It was the first lipo charger I ever bought, but I don't use it at all now. I'd sell it, but I would feel really bad about even giving it away to anyone. It never charged batteries higher than 8.39V in the end and there were numerous occasions where it took around 2.5 hours to balance charge a 5000mAh battery. The battery was not unbalanced either. The charger just sucks.

Just do a standard charge. It will work better without plugging the balance port in. If you have a whole night to charge one battery, then you can try balancing it. Otherwise I wouldn't bother with that charger. Once in a while it will do it in around an hour. Not usually though.