# Mini Power Brick

<figure><img src="https://2579565962-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MV6XXbIQHlfmsFqFok8%2Fuploads%2FF0HT2YZOobZ6xrpU9Qlg%2FAirbot%20Systems%20Mini%20power%20Brick%20100A.jpg?alt=media&#x26;token=5de36e67-f75b-4d8d-939a-11789616dda2" alt=""><figcaption></figcaption></figure>

## INTRO :

Airbot Systems Mini power Bricks encapsulate a high quality switch voltage regulator, that can support up to 12S voltage and 3A continuous power out. It has been developped to be as compact as possible and can be installed in any kind of UAV.&#x20;

The Mini power bricks integrates built in voltage and current sensing.\
The voltage & current informations are used to determine the consumed power, and to estimate remaining battery capacity. This in turn allows the flight controller to provide failsafe warnings and other actions in the event of low power.

**PRODUCT PAGE :** [https://www.airbot-systems.com/produit/airbot-systems-mini-power-brick/](https://www.airbot-systems.com/produit/airbot-systems-mini-power-brick/?lang=en)

## INSTALLATION :

The Airbot Systems Mini power brick should be installed like on the diagram below

<figure><img src="https://2579565962-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MV6XXbIQHlfmsFqFok8%2Fuploads%2FP2G8y2vBWWchxHDaDv6l%2F%20Mini%20power%20Brick%20Diagram.jpg?alt=media&#x26;token=c3eb851d-0bbf-4508-b512-d9f156a31f31" alt="" width="375"><figcaption></figcaption></figure>

<figure><img src="https://2579565962-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MV6XXbIQHlfmsFqFok8%2Fuploads%2FphrFvY64Y4Q4xPczCadm%2FAirbot%20Mini%20power%20brick%20current.jpg?alt=media&#x26;token=0a5cdf71-8229-43ea-a39e-c73801bb25b4" alt="" width="375"><figcaption></figcaption></figure>

{% hint style="success" %}
Note : To avoid any damage on the power supplies and grant long term reliability, we highly recommand to use anti-spark battery power connector on the power source ( like Amass XT90-S )
{% endhint %}

<figure><img src="https://2579565962-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MV6XXbIQHlfmsFqFok8%2Fuploads%2FhIRJ6V5OwnZTYlxBLjvA%2FXT90-S%20connector%20Airbot%20Systems.jpeg.webp?alt=media&#x26;token=637bc5c3-f55e-4dcf-9032-2aea6b19d217" alt="" width="375"><figcaption></figcaption></figure>

## &#x20;SPECIFICATIONS :

Overall dimensions : 44\*27\*17,6mm\
Mounting holes diameter : M3\
Mounting holes distance : 38mm\
Weight : 31g (including wires)\
\
Power supply max voltage input : 12S\
Power supply max current output : 3A\
\
Voltage sensing : Up to 12S\
Current sensing : 100A

<figure><img src="https://2579565962-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MV6XXbIQHlfmsFqFok8%2Fuploads%2F59KgM4V4toMREdRUHBMV%2FMini%20Power%20brick%20Dimensions.png?alt=media&#x26;token=84a7b8aa-a3b4-478a-a2c9-7f325f588ee4" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
**5V3 Power Supply :** If used to provide over 2A continuously, we highly recommend to use an active cooling in order to limit heat. \
**Current Sensor :** On a normal use we recommend to not exceed 60%-70% of the current sensor range current capability (60/70A continuous for the 100A version)<br>
{% endhint %}

### Main parameters&#x20;

**1 -** Connect the vehicle to you computer and open [Mission Planner](https://ardupilot.org/planner/docs/mission-planner-installation.html), then select the correct COM port and clic 'Connect' (top right corner of the main window)

**2 -** Go in the '**Setup**' Menu > **Optional Hardware**  > **Battery Monitor**

**3 -** Setup the fields like below :\
Monitor : Analog voltage and current\
Sensor : Other\
HW version : The Cube or Pixhawk / Cube Orange (if used)\
\
\&#xNAN;**>>>   Reboot your Cube after these changes   <<<**

<figure><img src="https://2579565962-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MV6XXbIQHlfmsFqFok8%2Fuploads%2FDSxRwJDnGvQtfee1lYd5%2FArdupilot_battery%20monitor.png?alt=media&#x26;token=3f8aee8f-a624-4fef-980d-092a507042e8" alt=""><figcaption></figcaption></figure>

**4** - Go in '**Config**' menu > **Full paramter tree** > **BATT**\
(clic on the little '+' to open the '**BATT**' parameters list)<br>

**5** - Set the following parameters, then clic 'Write Params' (right side of window) :

<pre><code><strong>BATT_MONITOR : 4 (voltage and current sensing)
</strong>BATT_AMP_OFFSET : 0,36 (*)
<strong>BATT_AMP_PERVLT : 34,0136
</strong>BATT_VOLT_MULT : 16 (**)
</code></pre>

(\*) This value can have to be ajusted a bit manually. It the consumption is lightly negative, reduce the value by 0.001.\
(\*\*) The value can need little manual adjustment. Connect a midd-life battery (50-70% charge) to the drone, and use a voltmeter to adjust the value, and get voltages matching as close as possible.

### Optional parameters :

&#x20;BATT\_CAPACITY : If set, you can get battery percentage value. But ! The drone will only count down the percentage from 100%. It will consider that each time you connect a battery, the battery is full. (even if empty) \
BATT\_ARM\_VOLT : Minimum voltage which is required to arm the aircraft \
BATT\_LOW\_VOLT : Low voltage level (used for failsafe) \
BATT\_CRT\_VOLT : Critical voltage level (used for failsafe \
BATT\_FS\_LOW\_ACT : Action the vehicle should perform if it hits the low voltage level BATT\_FS\_CRT\_ACT : Action the vehicle should perform if it hits the critical voltage level

#### **Extras :**

The power bricks CAD/3D models are downloadable from our dedicated page : <https://www.airbot-systems.com/free-downloads/>


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