Disclaimer: CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED "AS IS" AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
While we strive to provide accurate and up-to-date information, the rapidly evolving nature of battery technology means that information may become outdated or inaccurate over time. It is essential to independently verify any information presented on findyourbatteries.com. It is not intended to be a substitute for professional advice on battery power, energy or electrical systems, or related areas.
Some links on our website are affiliate links. Please note that we may earn commissions through affiliate links. As an Amazon Associate I earn from qualifying purchases. For more information about our content and participation in affiliate programs, please see our Terms of Use.
Exell A21PX Battery Specs
The Exell A21PX is a compatible battery replacement for the original PX21 and 523 batteries.
- Type: Alkaline
- Voltage: 4.5V
- Diameter: 16.8 mm (0.67″)
- Height: 49.9 mm (1.97″)
Battery Model: Exell A21PX
The Exell A21PX is an alkaline replacement for the original PX21 or 523 cell that was often used in older classic cameras and certain models of Apple Macintosh computers to help keep time, date, and configuration via the PRAM.
It is a cylindrical 4.5V battery with flat contacts on each end. It measures 16.8mm in diameter and 49.9mm in height.
Is the Exell A21PX battery known by another name or model number?
Yes, different brands give the same battery different model numbers. If you don’t specifically see the battery model number A21PX for sale, try searching for one of the other model numbers it is also known by or other applications the Exell A21PX battery also fits, as provided by the cross-reference and compatibility list below.
Exell A21PX Battery Replacement Cross-Reference & Compatibility List
The Exell A21PX battery fits and replaces the following and more:
- 523
- 1306AP
- 1979 Praktica EE2 Film Camera
- 1985 Apple Macintosh 512K
- 3LR50
- 523BP
- 6135-99-114-1239
- A133
- A21
- A21PX
- Ansi 1306M
- Ansi 1314M
- Apple MAC 512
- Apple MAC 512KE
- Apple MAC PLUS
- Apple Macintosh 512
- Apple MACINTOSH 512 KE
- Apple Macintosh 512K E
- Apple Macintosh Parameter RAM
- Apple Macintosh Parameter Random Access Memory
- Apple Macintosh Plus
- Apple Macintosh PRAM
- Apple PARAMETER RANDOM ACCESS MEMORY (PRAM)
- APX21
- AU7a Condenser Microphone
- BA-1098/U
- Battery-biz B270
- Bolex H16 Movie Camera
- Cardioid Microphone
- Clockmate Batteries 523
- CNB523 EN 133A
- Compuadd 386/16
- Compuadd 386/20
- Compuadd 386160
- Compuadd 38620
- D C Battery 523
- D C Battery DC523
- Dantona COMP49
- Dantona VPX21
- DigiTech DSP Digital Sound Processor 256XL EV PL76 Condenser
- Digitech DSP-256XL
- DigiTech GSP 21 pro
- Digitech GSP21 Guitar Signal Processor
- Duracell PX21
- E133
- E133N
- Electrovoice BK-1
- Electrovoice PL76 Microphone
- Electrovoice TR133A
- EN133A
- EN133A 4.5 V 4.2 Volt
- Energizer 1306AP
- Energizer 3LR50
- Energizer 523
- Energizer A133
- Energizer EN133A
- Energizer PC133A
- Energizer PX21
- EPX21
- Eveready 333
- Eveready E133
- EVERYREADY 523
- Exell Battery A133
- Fat Mac ElectroVoice PL76 microphone NEDA 1306
- Hewlett Packard PC133A
- Hewlett Packard TR133R
- HP (Hewlett Packard) PC133A
- HP (Hewlett Packard) TR133R
- IEC 3LR50
- IEC 3MR50
- IEC 3NR50
- IGT Fortune I Video Poker Slot Machine
- IGT Fortune II Video Poker Slot Machine
- Interstate Batteries APHO0110
- Interstate Batteries PHO0110
- Lith-10 or Maxell ER6C
- Mac Plus computer 523BP
- Mallory T133
- Mallory TR133
- Mallory TR133R
- Maxell ER6C
- Military BA1098U
- N133A
- NEDA 1306
- NEDA 1306A
- NEDA 1306AP
- NEDA 1306M
- NEDA 1314M
- NEDA 95F4751
- NEDA Type 1304
- NEDA1306A
- Newark 95F4751
- NO. 523 4 5V UCAR
- NO.523 UCAR 523
- Novacell NV 3LR50
- Novacell NV3LR50
- NSN 6135-99-114-1239
- Panasonic 3NR50
- Panasonic H3P
- Panasonic PX21
- Panasonic PX211
- PC133A
- Polaroid 268 flash
- Polaroid Automatic 100
- Power Pak PPPX21
- Praktica 35mm SLR EE2
- Praktica EE2
- Praktica EE2/EE3
- Praktica EE3
- Praktica LLC
- Praktica PLC2
- Praktica PLC2/PLC3
- Praktica PLC3
- Praktica VLC
- Praktica VLC/VLC2/VLC3
- Praktica VLC2
- Praktica VLC3
- PX21
- PX211
- PX21A
- R&D 5400
- Rayovac PX21
- Rayovac RPX21
- Rayovac RPX211
- Ray-o-vac T133M
- Rohrback CK3 corrosometer
- Rohrback Cosasco Systems Model CK-3 Portable CORROSOMETER
- RPX21
- Saft L56VA
- Salen 133A
- Salen TR133R
- SALEN133A
- Sonnenschein PC133A
- Syncron
- Tadiran 15-51-03-210-000
- Tadiran Lith-10
- Tadiran TL2100S
- TR133R
- UCAR TR133 4.2V
- US Military BA-1098/U
- V21PX
- Varta 523
- Varta 523BP
- Varta E133
- Varta E133N
- Varta N133A
- Varta PC133A
- Varta PX21
- Varta PX211
- Varta V21PX
Battery Chart for Exell A21PX
| Brand / Manufacturer | Exell Battery |
| Battery Model No. | A21PX |
| Common Replacement For | PX21, 523 |
| Type / Chemistry | Alkaline |
| Voltage | 4.5V |
| Capacity | 600mAh |
| Diameter | 0.67″ (16.8 mm) |
| Height | 1.97″ (49.9 mm) |