CMM1000 won't hold charge

[jpmile]

Hello,

About a month ago, I noticed the my CMM1000 would only go about 20 or 40 feet before running out of power. Previously, I could mow the entire front lawn without any problems. So, I bought new batteries, installed them, charged them up and...no difference. Can only go about 20 or 40 feet before it starts to lose power.

Any thoughts on what else the problem could be? I am a novice when it comes to this stuff, so any detailed explanations on how I can fix this is greatly appreciated!

Thanks for your help!

Jeff

[mechanic mark]

http://ec1.images-amazon.com/media/i...L000069594.pdf see page 10 troubleshooting

Black and Decker CMM1200 Parts List and Diagram - Type 1 : eReplacementParts.com your electric motor brushes may be worn out item 62, quantity 2.