Probably a dumb question that was asked at the Flying field today, but no one had an answer!

When you are using a 4.8 Volt/4 Cell Pack and generally when the pack reaches say for example 4.2 Volts, you can still fly but need to consider recharging the pack thereafter; so on a 6.0 Volt/5 Cell pack, can you fly if this pack gets down to 4.2 volts as well?

Sorry in advance if its a dumb question!