M. BindhammerI think for Quattro I will use a dual power supply. A CR1220 for the RTC and a LiPo for the rest. I got some ultra thin 3.7V LiPo's with an integrated protection circuitry.
- 40.8 x 30.2 x 3.8mm
- Protected against overcharging > 4.25V
- Protected against discharge < 3V
- Rated voltage 3.7V
- Capacity 500mA
Should fit nicely on one side of a 50 x 50mm PCB together with the coin cell holder, the charging circuit, USB connector and boost converter:
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