That’s not necessarily true. One or more of your batteries may have “fallen off the cliff” while the others are still simply “near the cliff” - very low but not quite dead.
Your extremely short battery life is definitely not normal. There are three likely causes:
- bad batteries (you’ve gone through at least two sets so this seems unlikely)
- improper battery alignment (see http://got.wf/swsbatteries)
- a hardware fault in the SKY itself (given your “wind sensor failed” error this seems likely)