If I am going to leave the house, I take a look at my battery level. If it is below 50%, I put a fresh one in. If I notice that my vape is getting a bit thin, that is one of the first things I check. Waiting until it says "low v" may not always be convenient.
Yea, there ain't nothing worse than leaving the house and getting about a mile away when the battery light flashes and did you remember to bring a spare???

