CNC-machined battery power backstop for XRAY X12ââ¬â¢22 made from premium-grade graphite material. The battery power backstop and rear link brace enable a wider array of battery pack positioning adjustment and match battery pack size. Frontward-placed battery pack makes the car safer to drive, decreases wheel lift in corners, and makes the car more predictable over bumps. Rearward-placed battery pack makes the car more aggressive, increases cornering speed, but makes the car much harder to use a vehicle.