I did some research about storing NiMH batteries properly and most of the time it's said to store them fully charged. Not so Traxxas! Read what they say:

"Nickel batteries should be fully discharged before charging, and should be stored fully discharged (just use the battery in your R/C vehicle until the battery can no longer move it)."

http://traxxas.com/node/76387

So is this just a wrong information (maybe to sell more batteries ... )?
Or is it better indeed to store them empty?