# Battery placement ## Placing the main battery The DeltaQuad Evo has a battery bay (blue), a payload bay (green), and an avionics bay (red).

The main battery needs to be placed on the tray in the battery bay which is located at the front of the fuselage.

The tray has the same form and shape as the underside of the battery.

The battery must be placed in such a way that it fits on the tray.

The thicker power cables must exit the bottom of the battery and lead over the top of the battery toward the XT90 socket of the DeltaQuad Evo.

{% hint style="info" %} The battery tray will move forward or backward to correct for the center of gravity depending on which payload is installed. Always make sure that no battery cable is located between the battery and the back wall of the battery bay. {% endhint %} {% hint style="warning" %} The main battery must be always installed in the battery bay as explained above. To extend the flight time and the total mission range of the DeltaQuad Evo, in addition to the main battery, the auxiliary battery can be installed in the payload bay. Never attempt to fly only with the auxiliary battery as this will lead to an incorrect center of gravity. The main battery must always be installed. {% endhint %} ## Placing the auxiliary battery Every DeltaQuad Evo comes with an auxiliary battery payload box.

As with the main battery tray the auxiliary battery holder is shaped like the battery bottom plate.

The auxiliary battery must be placed in such a way that it fits on the tray. The thicker power cables must exit the top of the battery and lead over the top of the battery toward the XT90 socket of the DeltaQuad Evo.

There is a latch mechanism on the auxiliary battery holder which secures the battery in place. After the battery is placed the latch needs to be rotated 90 degrees so it is positioned above the battery.

## Installing the auxiliary battery payload box {% hint style="danger" %} Always install fully charged batteries! Installing two batteries with different voltage levels can cause a fire. {% endhint %} {% hint style="info" %} The auxiliary battery payload box must be installed in payload slot 1, the payload slot at the rear end of the fuselage, as it is the heaviest payload. {% endhint %}

Every payload box displays two arrows on top of each handle.

There are corresponding arrows on the left and right sides of the DeltaQuad Evo's payload bay.

The arrows of the payload boxes must match the arrows in the payload bay.

The payload box orientation is important as its I/O board must align with the respective I/O board of the payload slot.

Slide the payload box into the payload slot.

Push both payload box handles down until you hear a click from the payload box locking mechanism to make sure that the box sits properly in its slot. The frame of a properly installed payload box sits flush with the frame of the payload bay.

## Empty payload box Before takeoff, the payload bay must be fully loaded with either two single payload boxes or one double payload box. If not the LCD above the avionics bay will read one of the following messages:

If payload slot 1 is loaded with, e.g. the Nighthawk 2, payload slot 2 needs to be loaded with the empty payload box which comes with every DeltaQuad Evo.