Replacement Battery for Apple Mac Plus PRAM

Exell A21PX Replacement Battery for Apple Mac Plus PRAM

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Battery Replacement for Apple Mac Plus PRAM

The Exell A21PX is a compatible battery replacement for the Apple Mac Plus PRAM.

  • Type: 4.5V PRAM Battery
  • Fits: Apple Mac Plus PRAM
  • Battery Model: Exell A21PX

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What kind of battery do I need for my Apple Mac Plus PRAM?

If you have a 1980’s vintage Apple Macintosh Plus and are looking for a battery for your PRAM, the 4.5V Exell A21PX battery is the proper replacement battery for the original but now discontinued 523 battery that the Mac Plus PRAM used.

The A21PX battery replacement for the Apple Mac Plus PRAM is cylindrical and has flat contacts on each end. It measures approximately 16.8mm in diameter and 49.9mm in height.

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What does PRAM mean?

PRAM stands for “Parameter Random Access Memory” (pronounced “P-ram”). All Macs use a battery for its PRAM, which stores the computer system’s configuration settings and helps keep time so that you don’t have to keep updating your system settings (things like display options, time zone, and speaker volume) on startup every time you turn your Mac on.

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