“If you charge your laptop to 100% and keep it at 100%, leaving it to charge overnight, this will have a negative effect on its aging”, because of lithium-ion batteries, summarizes Dominik Schulte, general manager of the German battery technology consulting company BatterieIngenieure, quoted by the American media Business Insider. Modern chargers are supposed to automatically cut off the power as soon as the battery reaches 100%. Except that in reality, the phone discharges even when it is not used. The charger then continues to power the phone as soon as it detects the slightest discharge. This alternation between mini-charges and mini-cuts risks altering the autonomy of the battery in the long term.