GNR Racing shorty battery mount kit is the best way to convert to a shorty lipo pack in your M-08. They are easily adjustable to different size shorty packs up to 96mm in length  and allow for bullet type batteries and quick battery change out.  The kit also saves 10 grams of weight on top of shorty battery weight savings. 
 
Includes
Carbon fiber upper battery mount X 2
Battery cradle X 2
Thumb wheels X2