Tired of your battery door falling off and dragging your expensive battery through the gravel, mud, and dirt? Yeah, We are too. Ampro Engineering Is proud to introduce a battery Door retainer for the Tamiya Grasshopper. This cannot be used if your Grasshopper has been upgraded to Hornet rear suspension. If you have a Grasshopper with the Hornet trans and sliders, we can upload a version with the needed battery retainer. Please refer to the video below for the installation.