HPR3765: Fixing clock events in GBA pokemon cartridges

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.
What happens when the internal battery runs dry? How to fix it?
Is this enough to completely restore calendar-based events?

• Tools:

  • https://github.com/megaboyexe/GBA_RTCRead
  • https://gbatemp.net/threads/how-to-reset-the-rtc-in-gba-pokemon-games-after-replacing-the-battery.558620/
  • Swapping battery instructions https://www.youtube.com/watch?v=1piXd3ffwug

• Additional resources:

  • https://www.youtube.com/watch?v=jzauCmOvF_U (few mistakes about here)
  • https://www.youtube.com/watch?v=TrIAyAKg2S0 (followup videos with corrections)

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