> For the complete documentation index, see [llms.txt](https://docs.deltaquad.com/tac/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.deltaquad.com/tac/setup/deltaquad-evo-battery/empty-payload-box.md).
# Empty Payload Box
Every DeltaQuad Evo comes with an empty payload box.
Before takeoff, the payload bay must be fully loaded with either two single payload boxes or one double payload box. Otherwise, the OLED screen above the avionics bay will display one of the following messages:
No payloads found
Slot 1: No payload
Slot 2: No payload
If payload slot 1 is occupied by, for example, the Raptor 360, then payload slot 2 must be filled with the empty payload box that comes with every DeltaQuad Evo.
{% hint style="info" %}
The vehicle will not initialize if the payload bay is either not fully loaded or incorrectly loaded.
{% endhint %}
---
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