Replacement battery for Ailunce HD1. Specifications: 3000mAh, 7.4V, Li-ion. Compatible with: Ailunce HD1, RT29, RT29D, RT29U. Replaces: Ailunce FA9140A, Retevis FA9140A. Retevis replacement battery designed for Two-Way Radio devices. Simple plug-and-play replacement requiring no modification.