Several factors can lead to the slow charging of a phone:
Low-power charger: If you are using a charger with a low-power output, such as an old or low-quality charger, it will charge your phone slower than a more powerful charger.
USB connection: Charging through a computer's USB port or using a low-quality USB cable can slow down the charging process.
Background processes: Running numerous apps or resource-intensive tasks while charging can reduce the charging speed.
Battery age: As batteries age, their charging speed may decrease, leading to slower charging times.
Temperature: High ambient temperatures can slow down charging to protect the battery from overheating.
To ensure faster charging, use a charger with a higher power output (as long as it's compatible with your device), use quality USB cables, close unnecessary apps while charging, and avoid exposing your phone to extreme temperatures during charging. If your phone's charging is significantly slower than usual, it may be worth inspecting the charger, cable, or battery health to identify potential issues.