Certain battery problems can prevent a battery from charging, but one of the first things you should check is whether your laptop has battery health settings that may prevent charging to 100%. On a MacBook, for example, this feature is called Optimized Battery Charging, while Windows has something similar called Smart Charging though some PC brands may use a different name. Essentially, these features help preserve the lithium ion battery in many laptops, since constantly charging to 100% can...
