#3 My machine will only run for a few minutes and then the batteries are dead.
Over the years I've heard countless times. Here's what to look for first. Sometimes it's not a battery problem it's an operator problem. Make sure it is actually being plugged in to charge after it is used. After plugging the charger in make sure it is actually coming on and charging. Can you see the amp reading display showing how many amps it is charging? Most newer machines come with onboard chargers.