Battery percentage is not battery health
A battery showing one hundred percent charge can still have reduced capacity. Health information should be considered together with a practical runtime test.
Heat accelerates ageing
Blocked ventilation, heavy heat and unsuitable charging conditions can shorten battery life. Keep vents clear and avoid leaving a hot laptop inside a closed vehicle or bag.
Use realistic expectations
Runtime depends on screen brightness, applications, wireless use and battery age. Refurbished product pages should use a test note or range rather than a universal promise.
Plan replacement
Before buying an older model, check whether a quality replacement battery is available and affordable.
