@DPM1952 what you described is exactly why you need to make sure all the equipment needed for flight is fully charged ,you were very lucky that you had VLOS, and were able to bring the drone home safely,i am not saying this to be clever ,but because it shows how easy it is to get caught out ,thats the reason for a pre-flight check ,you could have switched to your phone but this would have required it to be an Iphone with the same connector for the cable ,or a different cable for android and would have taken time to do ,if the drone was out of sight ,then a RTH would have been the way to go