The peak value is 7.7V max
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Thank you for the answer. Could you please explain in simple terms when you said "If the voltage can't drop below 7.7V after the diodes it probably means there is already that much from storage in the capacitors or leakage from 'SBATT'." - What is the storage that you are mentioning here?
"Consider what would happen if you removed everything after the diodes, would you still expect to see 0.7V across them?" - If I removed everything after the diodes, I would get a voltage of 8V-0.7V (typical) = 7.3V. Am I right?
And Actually, the 8V source, comes for two different voltage sources which are supposed to be identical in value. So, when one source is OFF, the other 8V source can power the circuit. That's why.