Speed control Question????

I don't want to pick any particular brand.

This is a general question!

On a helicopter do you use the low voltage cut off? (soft / hard ) or not at all!

I know it's is to keep the battery pack from going below a set voltage, to protect the battery

I had two incidents in the past year dumb me grabbed the wrong battery pack and it cost me repairs.

And Yes I the packs were charged just different ma's

I knew I was able to fly safe for 5 minutes with time to spare (with the correct pack), but for reasons I am not going to go into I just screwed up.

RCREDHOTS