FOR USE WITH: Syncron AU7a condenser microphone, Digitech DSP-256XL, Mallory TR133, Polaroid 268 flash, Polaroid Automatic 100, Praktica 35mm SLR EE2, Digitech GSP21 guitar signal processor, Rohrback Cosasco Systems Model CK-3, Portable CORROSOMETER, Rohrback CK3 corrosometer and MORE REPLACES: 1306AP, 3LR50, 523, A133, EN133A, PC133A, PX21, Eveready 333, E133, APHO0110, PHO0110, Varta 523, 523BP, E133, E133N, N133A, PC133A, PX21, PX211, V21PX A133 Exell Alkaline Battery A133 Compatible With 523 EN133A PC133A PX21 1306AP The A133, or 523, battery is an unusual cell often used in classic cameras. It is used to maintain computer time, date and configuration in certain models of computers (Parameter Random Access Memory, Parameter RAM, or just PRAM). This PX21 battery has an NSN number of 6135-99-114-1239 and a US Military part number of BA-1098/U. Specifications: Type: Alkaline, Voltage: 4.5V, Amperage: 600mAh, Diameter: 16.8 mm, Height: 49.9 mm, Terminals: Flat Contacts, Exell Alkaline Battery A133 For & Compatible With: 1306AP, 3LR50, 523, 6135-99-114-1239, A21, A21PX, A133, APX21, BA-1098/U, EN133A, EPX21, PC133A, PX21, RPX21, V21PX, Syncron AU7a condenser microphone Digitech DSP-256XL Mallory TR133 Polaroid 268 flash Polaroid Automatic 100 Praktica 35mm SLR EE2 Digitech GSP21 guitar signal processor PX21 Novacell NV3LR50 Novacell NV 3LR50 Rohrback Cosasco Systems Model CK-3 Portable CORROSOMETER Rohrback CK3 corrosometer Plus computer 523BP Electrovoice PL76 microphone PX21A 1985 512K Fat ElectroVoice PL76 microphone NEDA 1306 Eveready 333 DigiTech DSP digital sound processor 256XL EV PL76 Condenser Cardioid Microphone 1979 Praktica EE2 film camera EN133A NEDA1306A NEDA 1306A DigiTech GSP 21 pro EVERYREADY 523 523 CNB523 EN 133A NO. 523 4 5V UCAR NO.523 UCAR 523 UCAR TR133 4.2V EN133A 4.5 V 4.2 Volt NEDA Type 1304, Ray-O-Vac T133M, Mallory T133, Eveready E133. Original was a Electrovoice BK-1 condenser microphone TR133A, Novacell NV 3LR50, Eveready 333, NEDA 1306, 523, PX21, EN133A, PC133A, A133, 3LR50, 1306AP Tadiran 15-51-03-210-000 3.4 volt or Saft L56VA or Tadiran TL2100/S, Lith-10 or Maxell ER6C, VPX21, ANSI 1306M, ANSI 1314M, 512, 512KE, PLUS, 512, 512 KE, Battery-Biz B270, Clockmate Batteries 523, Compuadd 386/16, Compuadd 386/20, Compuadd 386160, Compuadd 38620, D C Battery 523, D C Battery DC523, COMP49, Exell Battery A133, Hewlett Packard PC133A