While I was mowing last fall (last mow of the year) my mower (1973 JD 110 with original engine) died right in the middle of the yard...no smoke...no sounds...just dead; like I turned the key off. When I turned the key to start it...nothing but silence. I pushed it back to the garage, covered it, and let it sleep for the winter. Last week I went out and it started...and then died after about 5 seconds. Then, when I turned the key to start it...nothing...silence. Could a bad battery be causing this??? Coil??? Any help you could give me would be greatly appreciated.