My anecdote: Macbook G4 - still works fine, boots up fast, resume/sleep very fast Macbook Pro 2010 - battery holds about 30 minute charge iPhone 4/4S - batte

My anecdote: Macbook G4 - still works fine, boots up fast, resume/sleep very fast Macbook Pro 2010 - battery holds about 30 minute charge iPhone 4/4S - batteries are fine, never replaced iPhone 5S - on my 4th battery