On the board, the hole with the pad gone, from which a little trench was made that uncovered some copper.

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   mmu_man (mmu_man@m.g3l.org)'s status on Monday, 29-Jul-2024 10:36:24 JST mmu_man

   in reply to

   Also, I noticed the pad for the negative battery terminal was so gone that the pad left on the other side didn't connect anymore to ground. I had to dig the epoxy to find the ground plane, and solder a wire to it.

   Can you spot the wire on the last photo?