I'd want 7v as an lvc as well, but if you can't set it that high, set at 6v and watch for teh slowing that was mentioned. After a few runs, it should be easy to see and tell its time to recharge. The other way is to watch what the charger puts back in - you don't want to be recharging more than 80%, so if its a 5000mah, if everything is where it needs to be, you will recharge less than 4000mah. I typically see 3700-3800mah (an a little more) on recharging.