APPLE BATTERY

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The evolution of early Apple battery technology spans several distinct chemical eras, moving from heavy sealed lead-acid packs in their first portables to advanced custom lithium-ion polymer designs.Core Specifications & Historical EvolutionSealed Lead-Acid Era (1989–1991): Used in the original Macintosh Portable and early PowerBook 100. Features included a 6V/6.5V 5Ah sealed lead-acid gel cell, providing an impressive 6 to 12 hours of runtime. Advantages included zero "memory effect" and stable power delivery, but at the cost of immense weight (adding to the Portable's 15.8 lb frame) and total failure if left fully discharged.Nickel-Cadmium (NiCad) Era (1991–1994): Standardized across the PowerBook 100 series (140, 160, 170, 180). Significantly reduced battery volume and overall laptop weight. Runtimes ranged from 2 to 3 hours, though cells suffered from severe memory effect if recharged before full depletion.Nickel-Metal Hydride (NiMH) Era (1992–1998): Adopted for the PowerBook Duo, PowerBook 500, and 5300 series. Offered higher energy density and reduced memory degradation compared to NiCad. Introduced Apple's first "Intelligent Battery" architecture in the PowerBook 500 series, which utilized internal microcontrollers to track charge state and cell health.Lithium-Ion (Li-ion) Transition (1995–Late 2000s): Introduced in later PowerBooks (G3/G4) and early MacBooks. Delivered high energy density, lightweight construction, and rapid charging without memory effect.