Gens Ace 4S hardcase LiPo batteries for RC vehicles. Built for 1/5 to 1/8 scale on-road and off-road cars. Multiple hardcase thicknesses are available, so you can choose the fit that works for your chassis. The durable hard case protects the cells and helps the pack last longer. Since 1998, Gens Ace has been dedicated to delivering stable, high-performance power products.