Charger just stop charging efficiently with tablet overnight.

Troubleshooting Slow Charging Issues on Your Lenovo P12 Tablet: A Guide to Diagnosing and Resolving Power Delivery Problems

If you’ve noticed that your Lenovo P12 tablet has recently stopped charging efficiently overnight, you’re not alone. Many users encounter charging inconsistencies that can be caused by a variety of hardware or software factors. In this article, we’ll explore common causes of slow or inconsistent charging, how to diagnose the issue, and potential solutions to restore optimal charging performance.

Understanding Your Device and Charger Specifications

Your Lenovo P12 tablet runs Android 15 and utilizes a 4.2V, 30W charging system. You’ve been using a Ugreen 30W charger for about a year, which previously provided reliable charging. However, recently, you’ve observed a significant slowdown in charging speed, despite the charger functioning correctly with other devices, such as your cellphone.

Symptoms and Observations

• Reduced Charging Rate: Using an app like Ampere indicates charging current fluctuating between 400mA and even dropping to zero.
• Inconsistent Charging: The tablet charges at rates lower than expected, around 400-1500mA, which is below typical fast-charging speeds.
• Normal Behavior with Other Devices: The same charger charges your cellphone normally, suggesting the issue may be isolated to the tablet.
• Battery Metrics: The battery’s maximum charge is at 92%, cycle count is 284, and the temperature is stable at around 30°C.
• Recent Changes: The device received a software update approximately a week ago.

Potential Causes of Charging Inefficiency

1. Software or Firmware Updates: Sometimes, system updates can alter power management settings or introduce bugs affecting charging behavior.
2. Charging Port or Cable Issues: Debris, damage, or loose connections in the charging port or cable can cause intermittent charging.
3. Battery Age or Degradation: While your battery appears healthy, repeated charge cycles can impact charging efficiency over time.
4. Charger Compatibility or Faults: Even if the charger works with other devices, compatibility issues can sometimes arise, especially if the device’s power management protocol changes post-update.
5. Power Supply Variability: Outlets or power strips may sometimes deliver inconsistent power, affecting charging performance.

Diagnostic Steps

1. Inspect the Charging Port and Cables:
2. Clean the charging port carefully with compressed air or a soft brush.