---
title: Lock Loses Power or Does Not Turn On
description: Troubleshoot a lock that does not power on after changing batteries. Learn how to use backup power, identify terminal issues, and restore TTLock connectivity.
---

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# Lock Loses Power or Does Not Turn On

#### Common causes of power loss and how to restore normal operation

If you’ve [changed the batteries](https://help.33lock.com/managing-lock-power-supply?hsLang=en-us) on a dead lock, and the lock still does not turn on, follow these steps to troubleshoot:

1. Utilize a [back-up power](https://help.33lock.com/managing-lock-power-supply?hsLang=en-us) bank and plug it into the bottom USB-C port on the outside panel of the lock. 
     1. If the lock powers on, this will be an indicator that there is something wrong with the battery terminals on the back side of the lock
2. Replace the back side of the lock (battery side) with a spare back side of the same lock in your inventory.

Once replaced, the lock will automatically reconnect to the TTLock platform.

If you do not have a spare lock on hand, contact [support@33lock.com](mailto:support@33lock.com) for replacement parts.

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