RoMill

ZT480EX shows 100% charge, runs fine but mower blade shut down after 5 seconds. Mower is over 1 year old but brand new, only .2 hours mostly my learning to drive it. Disconnected seat switch, mower blades would not engage so I assume that's okay. Checked battery voltage at charge port... 51 volts with key and lights on. Even though it's new, it has probably been sitting for a year although he did keep it charged. Would appreciate your thoughts. Thanks.