Keep charge between 20-80% and avoid heat

Keep your phone's battery between 20% and 80% most of the time and protect it from temperature extremes. Lithium-ion batteries degrade fastest at very high and very low charge levels, and heat accelerates permanent capacity loss.

Why It Works

Lithium-ion cells experience the most chemical stress when held at full charge or deeply discharged. Partial charging reduces voltage stress on the cathode, slowing long-term capacity fade. Heat increases the rate of unwanted side reactions inside the cell, permanently reducing capacity.

Tips

• Partial charges are fine -- short top-ups throughout the day are better than full drain-and-charge cycles
• Heat is the biggest enemy -- avoid leaving your phone in direct sunlight, hot cars, or charging while running demanding apps
• Extreme cold temporarily reduces performance but causes less permanent damage than heat
• Remove bulky cases while charging if the phone gets noticeably warm