6-dzm-20 12 volt 22 a/h (@20hr rate)deep cycle lawnmower battery (agm)DESIGNED SPECIFICALLY FOR HIGH DRAIN DEVICES SUCH AS LAWN MOWERS What does @20Hr Rate mean? A few years ago when you decided to purchase an automobile, there would be a sticker on the window which might have read 45 mpg. Of course everyone knew that the only way to make that car get 45 miles to the gallon was to drive at 25 miles per hour on a brand new level road. In 2008 when the EPA updated their standards, the ratings all dropped to much more