Single 3.7V Li-ion cell power back-up for Raspberry Pi

I have a small application continuously running on Raspberry Pi board. Sometimes, in my country, we have (short time) mains power failures. In such situation, my Raspberry board, powered by the wall adapter, turns off immediatly, without any attention for open files, transmissions in act, etcetera. This is really a problem. I decided to use …

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