The 50mAh rechargeable battery you're referring to, such as the LIR1154 A3HOC, is designed for compact wireless earphones like the AirPods Pro. These are typically lithium-ion rechargeable button cells or small cylindrical batteries optimized for size and capacity.

Key Features of the Battery:

1. Capacity: 50mAh – suitable for powering wireless earphones for a few hours on a single charge.

   Type: Li-ion or LiPo (Lithium-Ion Rechargeable).

   Model Reference: LIR1154 indicates the dimensions (approximately 11mm diameter and 5.4mm thickness), making it ideal for small devices.

   Use Case: Designed for AirPods Pro or similar wireless earphones, balancing compact size and energy density.

   Important Considerations:

   • Compatibility: Ensure the battery fits your device's size and voltage requirements.

   • Safety: Only purchase from reputable suppliers to avoid low-quality or counterfeit products.

   • Certifications: Look for products with certifications like UL, CE, and RoHS for safety and compliance.

   If you'd like, I can help you find a list of suppliers or specific manufacturers offering these batteries. Let me know!