All my 2s Hyperion Life on board batteries show 6.6 when fully charged. My XG8 battery does the same. If i get low enough for the buzzer to go off i stop straight away. Luckily this has only been while playing on the sim thus far. With a load on a Life battery will stay at 6.2 ish for the majority of the cycle of the battery. These batteries do not show the gradual decline that lipos do. After 6v the drop off is cliff like! Get her down if you're flying for real!