Six common charging myths were rejected after ZDNET reviewed manufacturer guidance and battery research, with the biggest takeaway that keeping a phone at 100% can increase battery stress.
0% drain-and-recharge cycles do not calibrate modern lithium-ion batteries, the report said, noting full discharges are a holdover from older nickel-based battery advice.
32°F to 95°F is the safe charging window cited by Apple, Google and Samsung; charging below freezing or in high heat can permanently damage performance and safety.
Overnight charging does not overcharge modern phones because built-in controls stop it, though using the device heavily while plugged in can slow charging and add heat.
Certified chargers matter more than brand, the report said, warning that cheap uncertified USB-C accessories can deliver unsafe power even if they fit the port.