> For the complete documentation index, see [llms.txt](https://docs.inspiredflight.com/inspired-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.inspiredflight.com/inspired-documentation/products/aircraft/if800-tomcat/if800-batteries/best-practices/ib388-flight.md).

# IB388 Flight

<table><thead><tr><th width="93">STEP</th><th>ACTION</th></tr></thead><tbody><tr><td>1</td><td><p>Ensure that both new batteries have a charge that is within 2-3% of each other and are active, with their indicator light blinking green. </p><p></p><p><mark style="color:orange;"><strong>NOTE:</strong></mark> If a Battery Indicator Button light is not blinking green, depress the button momentarily to wake up the battery. If it does not blink green then the battery may be faulty. See Section, <strong>Battery Health</strong>. </p><p></p></td></tr><tr><td>2</td><td>Insert the charged batteries into the aircraft.</td></tr><tr><td>3</td><td>Twist the battery lock to secure IB388 batteries.</td></tr><tr><td>4</td><td>Follow the instruction in Section, 'Powering On &#x26; Off the Aircraft'.</td></tr><tr><td>5</td><td>Verify in IGC that the battery percentage indicators have updated for the new batteries just installed and show a healthy status.</td></tr><tr><td><mark style="color:orange;"><strong>NOTE</strong></mark></td><td>If either battery health status indicator in IGC is red this means that <a data-footnote-ref href="#user-content-fn-1">Ardupilot</a> has been unable to establish communications with the new batteries. In this case, the pre-arm check will show “unhealthy” as shown below. Reboot the aircraft.</td></tr></tbody></table>

<figure><img src="/files/UEkc16uf7DGyTiGOfj5G" alt=""><figcaption></figcaption></figure>

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[^1]: Ardupilot is the main computer onboard the IF800 and maintains connections to batteries, payloads, and ground control stations.&#x20;