The next day I went to start the engine and for the 2nd time it did not start. The batteries were too weak. I used the jump battery and it barely had enough juice left to start the engine. For the entire trip back we had to leave the engine on as we sailed as we needed the engine to dock the boat at the marina. We sailed back with the wind at our backs. Half the trip back we had light winds which later picked up to 15 knots or more which is rather strong for us.