# Step 8: B3RB battery

## Introduction

Typical battery and battery connection

<figure><img src="https://396338415-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FU93yDWZcgjXGgsC1Duqv%2Fuploads%2FajlhoFB1TGBydOgSW2WN%2FWhatsApp%20Image%202025-05-30%20at%202.01.45%20PM.jpeg?alt=media&#x26;token=83f75b1f-9432-47d7-b805-4e4aafebf482" alt=""><figcaption></figcaption></figure>

{% hint style="success" %}
Side note: The 3D model for  the [rotating swing out battery connector extension](https://nxp.gitbook.io/mr-b3rb/advanced-user-contributed/3d-printed-parts/rotating-battery-plug-mount) has been prepared and may be 3D printed if a replacement is needed.&#x20;
{% endhint %}

There are two locations where on board batteries could be located after being connected

## Battery on Mezzanine level

1\)  On the "mezzanine" level of the frame and <br>

<figure><img src="https://396338415-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FU93yDWZcgjXGgsC1Duqv%2Fuploads%2FtTluvZvOkzl431h1Vhfj%2FWhatsApp%20Image%202025-05-30%20at%202.01.45%20PM%20(2).jpeg?alt=media&#x26;token=0ae99d3f-ff8b-49cb-9c89-46d170a339c3" alt=""><figcaption><p>Battery on Mezzanine level</p></figcaption></figure>

## Battery on Lower level of Frame

2\) On the lower part of the the lower chassis.&#x20;

<figure><img src="https://396338415-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FU93yDWZcgjXGgsC1Duqv%2Fuploads%2FrMe1Gjx0vfMClSsZxjNY%2FWhatsApp%20Image%202025-05-30%20at%202.01.45%20PM%20(4).jpeg?alt=media&#x26;token=d359e8b3-8441-4dd1-88d2-c6d1d770ba2e" alt=""><figcaption><p>Slide battery in end first</p></figcaption></figure>

<figure><img src="https://396338415-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FU93yDWZcgjXGgsC1Duqv%2Fuploads%2FwpmA8CyZ002NwfJdzBsh%2FWhatsApp%20Image%202025-05-30%20at%202.01.45%20PM%20(1).jpeg?alt=media&#x26;token=87211f38-3f52-4ebd-be84-a639ee462910" alt=""><figcaption><p>Battery on lower frame level (preferred)</p></figcaption></figure>

Since the mezzanine level may be used for additional electronics in the future, we will refer only to the removeable battery location on he lower chassis.

## Notes on Securing the battery

The exact method of securing the battery is dependent on the user preferences.&#x20;

* There is a battery strap included in the kit. This could also be used to strap to the upper/mezzanine level of the metal frame.&#x20;
* You may wish to remove the small plastic battery tray frame that is already installed in the kit in order to free up additional space.
* A foam piece can be used to wedge between the underside of the battery and the lower chassis in order to prevent any movement. This wedges the battery "up" against the underside of the mezzanine level.
* 3D printed pieces may be designed also to hold the battery in a preferred way.\ <br>

## Battery Power switch

Latest versions of MR-B3RB-M include a power switch mounted under the front edge of the B3RB. Toggle it to the on or off position as desired.

<figure><img src="https://396338415-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FU93yDWZcgjXGgsC1Duqv%2Fuploads%2FFqIX4TJxN1SaoXKtVk3f%2F1t7lqk1k.png?alt=media&#x26;token=05ef7c97-7ba0-4ea2-8fbe-6d5cd51fa184" alt=""><figcaption></figcaption></figure>
