<p>Pokemon games for the GBA (Game Boy Advance) have an internal RTC
chip with a coin battery to keep track of the time when the console is
powered off.<br />
What happens when the internal battery runs dry? How to fix it?<br />
Is this enough to completely restore calendar-based events?</p>
<ul>
<li><p>Tools:</p>
<ul>
<li><a
href="https://github.com/megaboyexe/GBA_RTCRead">https://github.com/megaboyexe/GBA_RTCRead</a></li>
<li><a
href="https://gbatemp.net/threads/how-to-reset-the-rtc-in-gba-pokemon-games-after-replacing-the-battery.558620/">https://gbatemp.net/threads/how-to-reset-the-rtc-in-gba-pokemon-games-after-replacing-the-battery.558620/</a></li>
<li>Swapping battery instructions <a
href="https://www.youtube.com/watch?v=1piXd3ffwug">https://www.youtube.com/watch?v=1piXd3ffwug</a></li>
</ul></li>
<li><p>Additional resources:</p>
<ul>
<li><a
href="https://www.youtube.com/watch?v=jzauCmOvF_U">https://www.youtube.com/watch?v=jzauCmOvF_U</a>
(few mistakes about here)</li>
<li><a
href="https://www.youtube.com/watch?v=TrIAyAKg2S0">https://www.youtube.com/watch?v=TrIAyAKg2S0</a>
(followup videos with corrections)</li>
</ul></li>
</ul>
