PowerBook 200 Series -- Type III Battery and System 7.5.1

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By Heath Culp

If you have a Macintosh PowerBook Duo (200 series) computer, and you have installed the System 7.5 Update 1.0, the external recharger may show a red light when you try to charge a Type III battery. You need to install the Type III battery extension into the System folder. Do not remove this extension even after you have installed System 7.5 and the System 7.5 Update 1.0. The extension is on a disk called Battery Tools, which ships with the Type III battery.

Background

When the System 7.5 Update 1.0 extension loads, it replaces the PG&E (battery management) code. This PG&E code then reloads to the external battery charger. Because of this, the external recharger does not recognize the Type III batteries and you get the red light. However, the batteries charge fine in the computer itself.

Conclusion

You need to use the Type III Battery extension to get the external charger to work with System Software 7.5.1 (System 7.5 plus the System 7.5 Update 1.0) and Type III batteries.

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