Ledger Battery Not Charging or Temperature Warning How to Troubleshoot
Two distinct battery problems can stop your Ledger from working normally. One is the "cannot charge" error; the other is a "temperature too high" warning. They have different causes and different fixes. This page walks through both.
The "cannot charge" error
Your Ledger might refuse to charge even when plugged into a known working cable and power source. This often comes down to a firmware bug. Battery calibration can also drift over time, making the device misreport its charge level.
Start with a firmware update. Connect your Ledger to Ledger Live and check for any available firmware version. If one exists, install it. The update often patches charging-related bugs.
If the device is already on the latest firmware, try a battery recalibration. Drain the battery completely until the device shuts off on its own, then let it sit for an hour. Plug it in and charge to 100% without interruption. Do not use the device during this charge cycle. Some users report that repeating this cycle two or three times restores normal charging behavior.
Another common cause is a bad cable or port. Test with multiple USB cables, try a different computer port, and use a wall adapter rated at least 1 amp. Avoid USB hubs. The Ledger needs stable power.
If none of that works, the battery itself may have a hardware defect. Ledger uses rechargeable lithium-ion cells, and these can fail. Contact Ledger support through their official website. Provide your device model and purchase details. Some units under warranty may qualify for replacement.
The "temperature too high" warning
Your Ledger has a thermal sensor that monitors internal temperature during charging and heavy use. When the sensor detects temperatures above a safe threshold, the device displays a warning and stops charging or operating.
This warning usually means the device is in a hot environment. Direct sunlight, a closed car, or a spot near a radiator can trigger it. Move the Ledger to a cooler area and let it rest for 30 minutes. The warning should clear on its own.
Charging while the device is in a case can trap heat. Remove the case during charging. Do not place the device on soft surfaces like beds or couches while it charges, because those surfaces block airflow.
Heavy use of the Ledger's processor can also raise internal temperatures. This happens during firmware updates, large transaction signing, or when running certain apps. If the warning appears during use, stop the activity, let the device cool down, and resume later.
Persistent temperature warnings at room temperature suggest a hardware fault. The thermal sensor may be defective, or the battery may be failing and generating excess heat. Both require hardware service. Contact Ledger support.
What not to do
Do not try to open the Ledger case. It is sealed. Opening it voids the warranty. Do not attempt battery replacement yourself; the battery is soldered in. Do not put the device in a refrigerator or freezer. Condensation can destroy the electronics.
When to seek replacement
The software fixes described here work for most users. If you have tried firmware updates, recalibration, and proper charging conditions with no result, the problem is likely hardware. Ledger support can advise on replacement options.
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Summary of Steps
For charging failure: update firmware, drain and recharge fully, test cables and ports, contact support if nothing works.
For temperature warning: move to cooler area, remove case, stop heavy use, let device cool. Persistent warnings at normal temperatures mean hardware service is needed.
Both problems have software fixes to try first. Neither problem affects the security of your crypto keys. The Ledger's secure element and PIN protection remain intact regardless of battery state. A dead battery means you need USB power to use the device; a temperature warning means you must wait before using it.
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