CNC-machined battery pack backstop for XRAY X12ââ¬â¢22 produced from premium-grade graphite material. The battery pack backstop and rear link brace allow for a wider range of battery placement modification and match battery pack size. Frontward-placed battery pack makes the automobile simpler to drive, reduces wheel lift in corners, and makes the vehicle more predictable over bumps. Rearward-placed battery pack makes the car more aggressive, increases cornering rate, but makes the car more challenging to drive.