Exell A21PX 4.5V Alkaline Battery Replaces Eveready 333, 523, PX21, PC133A Fits Mac Plus, Electro-Voice Mic, Polaroid Flash, GE Radio, Smoke Detector, Vintage Electronics

About this item

• Reliable 4.5V Power Source: Delivers stable voltage for legacy technology, audio equipment, and safety devices requiring consistent power output
• Mac Plus and Classic Compatibility: Used in original Macintosh clock and CMOS battery slots to maintain system settings and timekeeping functions
• Electro-Voice and Audio Equipment Support: Replaces Eveready 333 in classic condenser microphones and professional audio gear
• Polaroid and Flash Unit Compatibility: Compatible with vintage cameras and strobe equipment requiring 4.5V power supply
• Direct Replacement Battery: Replaces discontinued models including Eveready 333, 523, PX21, and PC133A for various vintage electronics
• US-Based Company Support: Trusted performance with customer support provided from US-based facility for quality assurance