Power banks are not bad for iPhones when used correctly. High-quality, certified power banks are designed to deliver stable voltage and current, which keeps your iPhone safe during charging. Problems usually occur with cheap or poorly made power banks that lack proper protection.

To protect your iPhone battery, choose a power bank that supports Apple charging standards and fast-charge protocols. Avoid overheating by using good cables and not charging in extreme temperatures. With the right power bank, occasional or daily use is safe and convenient.

If your power bank is not working with your iPhone, the most common reasons are cable or compatibility issues. A damaged cable, low-quality adapter, or a power bank that doesn’t support iPhone charging standards may fail to deliver power. Also check if the power bank itself is fully charged.

Another possible cause is protection or software limits. Some power banks shut off automatically if the output is too low, while iPhones may stop charging if the device overheats. Using certified cables and a compatible power bank usually resolves the issue.

The healthiest way to charge an iPhone is to keep the battery between 20% and 80% whenever possible. Avoid letting it drain to 0% or charging it to 100% too often, as extreme levels increase battery wear. Slow, steady charging also helps reduce long-term degradation.

Using certified chargers and cables is essential for battery health. Keep your iPhone cool while charging and avoid heavy use during charging sessions. Enabling Optimized Battery Charging in iOS further protects the battery by reducing unnecessary full charges.

Apple warns that charging an iPhone overnight can cause excess heat if the phone is covered or placed on soft surfaces like beds or pillows. Heat is one of the main factors that accelerates battery aging and can affect long-term performance.

To reduce this risk, Apple advises charging in a well-ventilated area using certified chargers and cables. Enabling Optimized Battery Charging also helps by limiting how long the battery stays at 100%, improving safety and battery lifespan.