The extended quick release battery hold downs for E-Maxx® make it easy to install small or large format, multi-cell battery packs. Stock E-Maxx hold downs offer the options of 21mm and 27mm of clearance for standard 6-or 7-cell NiMH battery packs. The reversible accessory hold downs offer additional options for both larger and smaller batter packs. Foam spacers are included to center the battery packs for optimum clearance and weight distribution.