How can one tell if the Phantom battery is defective? And related questions... What is the life span of these Phantom flight batteries? Is there a way to recondition these batteries, such as drain and recharge? The battery in question appears to charge up like normal. It gives me 4 green bars and I use it in flight with the P2V+. But at 53% I see the battery icon blinking red and the aircraft goes into auto-land mode. It is too far away to get it home and it does not respond to the remote control anyway. I lost the aircraft that day. It went down over a ridge behind a line of trees near the river at Sparrows Point MD. I would share the video but it isn't very interesting. I believe the Find-My-Phantom app only works if you have a service provider for the phone. I do not. I use the smartphone only for the Phantom. After about 3 hours of searching I actually found it with no major damage. I have used this battery about 7 times in P2V before using it in the P2V+. Could that be an issue? I am on the most current version of the Android app. There is an option in the app that causes a auto return-to-home on a low battery. On my first test flight in my back yard this RTH kicked in with the battery at 40% which resulted in a very rough landing. This struck me as odd because the aircraft was no higher than 100 feet over my neighbor's house. And the threshold is supposed to be 30% anyway. I cannot risk that happening again so I disabled that auto RTH on low battery. As I have multiple batteries I cannot be sure if it was the same one in use. But clearly something is wrong. Is it the firmware? Is it the app? Is it the battery? I could use some suggestions.