I recently purchased a new battery for my mower. after a couple of hours of constant use the mower quit. when I attempted to restart I got a "click" I tested the batt. for charge and it was down. Recharged and it again worked well for a couple of hours, before abruptly quitting. I again went through the above procedure, but this time after charging I still only get a "click". does this seem like a starter issue? or solenoid? or other? any assistance will be appreciated. Thanks, Bur