Smartphone battery health and iPhone 18 charging performance

Recent technical analyses and testing provide insights into smartphone battery maintenance and the charging performance of the iPhone 18 series.

Regarding battery longevity, experts suggest that maintaining lithium-ion battery levels between 20% and 80% can help preserve battery health. Charging to 100% frequently can subject the battery to higher voltage and heat, potentially accelerating degradation. While occasional full charges are acceptable for long-term use, avoiding the habit of leaving devices plugged in for extended periods after reaching full capacity is recommended.

In terms of charging technology, Programmable Power Supply (PPS) is highlighted as an efficient feature of USB Power Delivery 3.0, allowing chargers to dynamically adjust voltage and current to match device needs.

Testing on the iPhone 18 Pro Max shows that wired charging can reach 50% capacity in approximately 15 minutes, but the speed decreases significantly as the battery nears full capacity. For instance, using a 100W charger, the device may take about 64 minutes to reach 100%. MagSafe wireless charging is notably slower, requiring roughly 30 minutes to reach a 50% charge.