Q: What happens if I have another higher voltage source in my board?


A: There is a reverse protection Schottky diode on H04R10 that prevents current from flowing back into the coin-cell battery in case you have higher voltage (e.g., 3.3V or 5V) applied at the same time. Note that although Schottky diodes have low forward voltage drop, the drop can reach 300mV at the mentioned battery discharge rate. To avoid having a lower output voltage (3-0.3 = 2.7V), you can short the reverse protection diode on H04R10 with a solder jumper.

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