Fixing the battery
This machine came with a dead battery, and it causes boot failures.
The battery is embedded in a “chip” like thing that contains a real-time clock, memory and the battery, all helpfully enclosed in an epoxy layer - so the battery cannot be replaced. The type of the thing is Odin oec12c887a. A replacement for this, the Dallas ds12C887A is still available but sourcing a new one is hard.
I attempted to repair the module by adding an external battery. Links:
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