[Solved / Archived] Alternate RTC backup battery

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Last Post by uugear 11 months ago

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Matt Schneider

(@matt-schneider)

Posts: 1

New Member Customer

Topic starter

Hello, I just ordered the Witty Pi 4 mini and am wondering how hard would it be for me to swap out the ultra-capacitor energy backup for the RTC with a pancake battery or similar. The documentation indicates that the ultra-capacitor back-up time is less than 24 hrs. I am hoping to have my system robust against months long power outages, and having something like a CR1220 or similar would allow that. Can't wait to try this power control system out!

Posted : 28/12/2023 5:08 am

uugear

(@admin)

Posts: 479

Member Admin

The simpliest way is to connect the battery between 3V3 and GND, and put a diode in serial, like this:

(Battery+) ---|>|--- 3V3

(Battery-) ----------- GND

This way your battery will not be drained when the device is powered. You can use the 3V3 pin in header P3, P4 or P5 (they are the same).

Posted : 11/01/2024 4:51 pm