La batterie Ninja 300 est décar

Hello, I can help me, I have a Kawasaki Ninja 300 and one day that I went to roll, I began to mark the battery witness, change the battery but to the days I mark it again, check it with the multimeter and 4000 revolutions gaine 14.5 of voltage and I do not understand by it is downloaded, some that can help me, beforehand I appreciate them