Battery Overload

The battery was overloaded and has more than likely self landed. Another error you could see is battery output too high.

Cause:

1. The aircraft has flown an excessively long distance with a full payload. Also if you took off with a full tank and not a fully charged battery.
   1. As the battery percentage goes down, the voltage of the battery goes down which results in the max payload being decreased. So long ferry distances you must reduce the payload to compensate.
2. The battery connectors or power distribution board connectors are corroded or overheated.
   1. Clean off ports, as well as check battery temperature.
3. An esc has overheated or been overloaded
   1. Check around time of self landing in error history for any esc errors. 
4. The alignment of the props or motors is off causing an overload.
   1. Look over prop and motors.
5. The battery is aged after a large number of cycles.
6. The battery has become faulty
   1. Mark the battery and see if the problem only happens on one specific battery.

Solutions:

1. Reduce Payload
2. Make sure the battery is full when taking off.
3. Use other batteries and mark the battery which it occurred to. 
4. A small amount of dielectric grease on the port has been said to help with connectivity.
5. If the problem is constant with one battery it is an issue with the battery and will need to be replaced.
6. If the problem is with all batteries, check for any esc errors and if none are present in history replace the power distribution board.

Conclusion:

It is very important to monitor your battery level as well as your payload. Try to keep your batteries cool the best you can and monitor the temperatures. Reduce flying with deadweight in the tank, which means only fly with the amount of product that you will need before swapping batteries. Doing this will help maintain your drone and battery health.