I have a 2020 Cub Cadet with a 22hp Kawasaki engine which I have owned since new. Last year, it started to discharge the battery while it was running. I replaced the battery, then the voltage regulator and most recently the alternator. but the problem still persists. If I charge the battery, I can run the machine indefinitely, but if I run it for about 1 1/2, it will not restart without recharging the battery. I run the mower at full speed. Any one got any suggestion as to what is causing the battery not keeping its charge?