Hearing aid battery compartment housings protect internal batteries and circuits, requiring miniaturization, sealing and anti-vibration performance, adapting to long-term wearing and movement, no battery displacement and circuit damage. Traditional mechanical assembly has gaps, easy entry of sweat and dust, leading to circuit short circuit. DaokeDao laser welding has ultra-high precision, suitable for medical-grade PC and ABS miniaturized components, forming a compact and sealed weld, blocking sweat and dust intrusion, protecting internal batteries and circuits. The non-contact process does not damage internal precision circuits, ensuring normal hearing aid operation. The weld has high strength, resists wearing vibration without loosening, long service life. The equipment adapts to ultra-miniaturized component welding, suitable for hearing aid manufacturers, improving product durability and user wearing experience.