# The clock is wrong

## Before you move on

You are here because you noticed that the clock in the top of the user interface is wrong.

Is this not the case? Then let's take a step back. [Does your BactoBox® not power on](/troubleshooting/power-on-fails.md)? [Does the *QC test* program give errors](/troubleshooting/qualification-fails/i-get-error-40xx.md)?

See also [BactoBox® acting up?](/troubleshooting/bactobox-r-acting-up.md).

<img src="/files/4YvqkQVU1cELIaUHIgWW" alt="" class="gitbook-drawing">

## BactoBox® forgets the time and date

You set the time and date but BactoBox® forgets it whenever you [power cycle](https://en.wikipedia.org/wiki/Power_cycling) it.

**The internal** [**RTC battery**](https://en.wikipedia.org/wiki/Real-time_clock#Power_source) **is depleted.**

{% stepper %}
{% step %}

#### Charge the RTC battery

[Power on](/getting-started/installation/power-on.md) BactoBox® and let it idle for **24 hours**. The RTC battery charges while BactoBox® is powered on.
{% endstep %}

{% step %}

#### Set the time and date

[Set the time and date](/encyclopedia/software/user-interface/menu-system.md#time-and-date). Once the RTC battery is charged, BactoBox® remembers the date and time even after rebooting.
{% endstep %}
{% endstepper %}

{% hint style="info" %}

### The RTC battery in BactoBox® holds its charge for 2 months

After 2 months without power, the RTC battery is depleted and BactoBox® forgets the time and date.

Keep BactoBox® powered on regularly to avoid this situation in the first place. **The rocker switch must be in the&#x20;*****On*****&#x20;position.** It is *not* enough to just insert the power cable.
{% endhint %}

## The clock does not show the correct time

First [set the time zone](/encyclopedia/software/user-interface/menu-system.md#time-zone) and then [set the time and date](/encyclopedia/software/user-interface/menu-system.md#time-and-date).


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