MarkTer

So I bought a riding mower last spring. The first year of use was amazing. For the winter I packed it into my garage and left it on the charger. about a month back I was doing some organization in my garage and I unplugged the mower. Forgot to plug it back in. Fast forward to this past weekend and I got the mower out of the garage. Turned on the key and nothing. Plugged it into the charger and again nothing. Turns out the battery’s were under 50% and would not take a charge. So I disconnected all the battery’s and charged them individually to 10v. This worked as the regular charger started working again. So I charged it up to full power. ‘’today I put the key in. Turned it on. And power shows as fully charged. Put the mower in forward. Stepped on the pedal and nothing happened. Put it in reverse. Nothing. Turned on lights. Nothing. Tried to engage blades. Nothing. The aux jack has no power either. But it’s still showing full charge on the display. anyone have any thoughts. My attempts to contact ryobi gave me nothing but try to charge it longer or buy new batteries. Both make no sense. Looking for some help. Thanks.