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RTC Crystal location (OPI2):
It is practically impossible to find (and cut) CPU-K6 trace.
Connecting the battery to VCC-RTC is not an option (it is easy, there is RTC test point), it is connected to to much circuitry and draws ~50 mA.
I can only hope the future board design (or new board revision) will have the RTC battery connector or battery pads (costs nothing).
So for now the only battery backed RTC option is the external RTC module.
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