Tablet losing charge while plugged in: device case causing thermal restriction or insufficient charger wattage

Android

If your tablet is losing battery charge even though it's plugged in and showing a charging icon, the issue is usually caused by insufficient charger wattage or heat buildup from a protective case. This guide walks you through diagnosing and resolving the problem.

Before you begin

This issue occurs when your device is running continuously in Kiosk mode with the screen always on. Tablets in this state draw significant power, and if your charger can't supply enough wattage to both run the device and charge the battery simultaneously, the battery will continue to drain.

Note: This is a hardware issue unrelated to Esper Console configuration or your device management setup.

Step 1: Verify the charger is being recognized

1. Check your device screen while it's plugged in.
2. Confirm the charging icon is visible in the status bar.
3. If the charging icon is not present, try a different USB cable or power outlet.

Step 2: Remove the device case

1. Remove any protective case from your tablet.
2. Leave the device case off and allow the tablet to run in Kiosk mode for 15–30 minutes.
3. Check whether the battery level stabilizes or begins to increase.

Device cases can trap heat and cause your tablet to throttle charging current as a thermal protection measure. If the battery charge improves after removing the case, poor heat dissipation is contributing to your issue.

For permanent deployments, consider using cases with ventilation slots or mesh panels designed for always-on use.

Step 3: Replace the charger with an OEM-recommended model

1. Check your tablet manufacturer's specification sheet for the recommended charger wattage.
2. Tablets typically require a minimum of 10W under continuous active use — verify the exact figure for your device model.
3. Replace your current charger and USB cable with the OEM-recommended charger at the correct wattage.
4. Ensure you use OEM-certified accessories; third-party chargers may not negotiate the correct charging voltage or current profile (such as Qualcomm Quick Charge or USB Power Delivery).

Do not use 5W USB chargers (designed for smartphones) with tablets running continuous Kiosk mode — they cannot supply enough power for both operation and charging.

Step 4: Test with the new charger

1. Plug in your tablet using the OEM-recommended charger.
2. Keep the device running in Kiosk mode with the screen on.
3. Wait 15–30 minutes.
4. Check that the battery percentage is increasing or holding steady.
5. Verify the charging icon remains visible throughout the test.

Step 5: Check battery telemetry (optional)

If your device is enrolled in Esper, you can view battery history to confirm the issue is resolved:

1. Go to Devices & Groups → [Device Name] → Device Info / Telemetry.
2. Review the battery level history to see the rate of drain or charge over time.
3. Correlate battery data with screen activity to confirm the battery is holding steady during active use.

If the problem persists

• Battery still drains with an OEM charger at correct wattage: The device battery or charging port may be defective. Contact your tablet manufacturer for hardware warranty support.
• Issue occurs across multiple devices on the same charger: If you're using a powered USB hub, verify the power adapter is rated for the combined load of all connected devices. Check the hub specifications for maximum power output.
• Thermal throttling without a case: Check your ambient environment for temperature issues — direct sunlight, enclosed spaces, or high room temperature can cause thermal throttling even without a case.

Still need help?

If you've completed these steps and your tablet is still losing charge, contact Esper Support. Provide details about your charger wattage, device model, case type (if any), and battery drain rate from telemetry if available.