Much, much simpler. The LifePO4 Mini 6.6V without the battery management system, and with a 5V linear regulator on the output to get 5V. There is no undervoltage protection. No charging circuit.
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Hardware: RPi Zero W | Allo Kali | ProtoDAC TDA1387 X8 | PGA2311 | Icepower 500ASP | Harbeth SHL5
Software: Moode 8.3.3
Source: Win 10 NAS
Software: Moode 8.3.3
Source: Win 10 NAS