I started the mower, MTD Yardman 17.5 hp B&S, cut the lawn and put it away. I tried to start it a couple days later and it wouldn't start. I did not even get a "click" from the starter solenoid. I was able to jump start it with a portable jump pack. After turning it off it would not start. I put a new battery in and it started right up. I shut it off after moving the mower to the shed and tried to start it again and it would not start. It will jump start though. The battery does not seem to be getting a charge.

Is there an alternator or some other kind of charging system on this law mower? Or is there something else that might be the problem.

Any help would be appreciated.