I have been researching batteries for the xr650l. People are downsizing the stock battery, wich is the ytx9 and going down to the ytx5. The difference is 1.7 pounds and the 9 is 8ah and the 5 is 5ah. Is the difference in ah any type of a problem? Odyssey makes the 310 wich is stronger and better, but .3 lbs heavier, and 3 times as much!