My friend just bought a Losi so I will have him measure the battery tray. The problem with the 5440SC for the AE tray might be the height as this pack will be at 47mm which might be to high for the Losi body. Our 5040SC is not as high and comes in at 162mm in length so if the Losi tray has 162 or more this pack will be fine on height as it's fairly thin.