I bought my LM2100 mower about a month ago. I only used it once and now I mowed part of my yard left and came back a few hours later. My battery was charging while I was gone with a full charge. It started as I ran it across the driveway but than it stopped and the battery isn't making a connection whatsoever as the indicator light nor the headlights will come on while the battery pack is seated properly. How can I correct this problem?