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Smartphone Battery Mass Increase

The concept that a fully charged smartphone battery gains a small amount of mass due to the energy stored, based on Einstein's mass-energy equivalence principle.

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Jan 12, 2026
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How big is the mass change from charging a typical smartphone battery in grams and scientific notation?

A fully charged smartphone battery gains an amount of mass so vanishingly small that it is undetectable in ordinary measurement: published community calculations and popular summaries put the increase...