The Battery Shim is designed to secure and stabilize the battery inside select handheld units. It ensures the battery fits snugly, maintains proper electrical contact, and prevents intermittent power loss, especially in high‑vibration environments. This small spacer is essential when using replacement batteries or older handhelds with slight housing wear. This shim is most commonly used in the Freedom Handheld (FTX‑450‑011K / FTX‑454‑011K).