Why my mower kill batteries

[zima]

Its a 52 exmark hidro it just runs whit a new battery for a few hours and then it dosen't keep it charge. it kill it. can someone help me. Thank you.

[mx495]

Either something is draining the battery, or it is not charging. Use a voltmeter to see what it is putting out when it is running. If it is not charging, could be the voltage regulator or stator. If it is putting out the correct voltage and running the battery down, I would guess you have a short somewhere drainiing the battery, like a bare wire touching metal.