I'm in need of help with electric mower

Since there is not a newsgroup just on mowers, I am hoping that someone might
be able to steer me in the direction of getting my electric lawn mower working
again. It's a Ryobi electric lawnmower, and I don't have any manuals or
schematics.

I posted some sketches and photos that I hope will help he
http://www.geocities.com/hbcalifornee2002/mower.html

Here's the problem:

This problem started all at once. One day I mowed for an hour with no trouble,
then the next weekend, it would only run 5-10 minutes before draining the
battery. Battery is less than six months old.

Another strange thing is that when I plug the mower in to recharge, the
"charge" light indicates that the battery is fully charged, while the
"Empty/Full" meter shows it as being "Empty." (The "charge" light is connected
to the charger board, and the "Empty/Full" meter is connected to the relay
board.

After charging overnight, the "Empty/Full" meter shows "Full" and the "charge"
light still shows fully charged. After running again for 5 minutes, the meter
goes to "Empty." Plugging in again, and the "charge" light still shows fully
charged.

Please send me an email if you have any idea of what might be causing the
problem.

Thanks very much!