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