Keeping your phone plugged in once it hits a full charge and consistently charging it to 100% keeps the battery at a high voltage, which causes chemical aging in the product, said Dibakar Datta , an ...

Keeping a phone fully charged is the only way to make sure it's ready for a long day. But there's a major difference between being "charged" and being "healthy." Most modern Androids and iPhones are ...

The charging advice millions have followed for years turns out to be based on a half-truth — and the real threat to your phone's battery is something most people never consider.

In 2025, CNET tested the battery life of 35 phones, and our overall top performer is the iPhone 17 Pro Max. At a starting ...