Raspberry Pi 5 Real-Time Clock (RTC) Battery (CE09774)

Support Product Questions
1

This is a placeholder topic for “Raspberry Pi 5 Real-Time Clock (RTC) Battery” comments.

Keep your Raspberry Pi 5 on time even when the power is disconnected with the Real-Time Clock (RTC) Battery.

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2

This is a nice little battery, but I think the text in the description field is flawed.

That shows how to enable a low-current wake on alarm, which is of zero use to me.

What it omits is how to enable charging and how to test the battery’s voltage.

"To charge the battery at a set voltage, add rtc_bbat_vchg to /boot/firmware/config.txt:

dtparam=rtc_bbat_vchg=3000000

Reboot with sudo reboot to use the new voltage setting."

Reference: https://www.raspberrypi.com/documentation/computers/raspberry-pi.html (Search RTC and you’ll get there eventually)

“vcgencmd pmic_read_adc BATT_V” will report the voltage.

3

Hey @Greig63365,

Good spot! I’ll get the description modified to better align with Raspberry Pi’s official documentation.

4

Thanks Zach! I thought I was adding a note to the product, but if you can fix it in the listing that’s even better.

- Greig.