I purchased a mower, trimmer, and leaf blower at the same time, probably three years ago. I registered the batteries and chargers but when I check my account, it says I have no warranties. Last week, all three batteries were fine. Today I tried to use one of the 2.0 AH batteries in the mower and it only ran about three minutes before it went red. When I put it on the charger, it goes to blinking red, which means it is defective. Is there anything I can do with the battery to fix it? I would hate to buy a new one if there is something that can be done to make this one work because three years on a battery isn't very long. I would hate to have to spend $700 to replace all three of my batteries if they're all going to die soon.