Adjustable battery pack owner permits to maneuver the batteries front side and back but also left to suitable for simple and comfortable weight transfer adjustment. The holder enables to move the battery which changes the Front/Rear fat stability by 4mm. The metal product adds additional 7.5g fat for tuning the side-to-side stability weight toward battery part for tuning side-to-side balance. Design associated with battery pack holder eliminates any negative chassis flex.