en/accessories/battery/2p-rtc-bat

[giscus[bot]]

en/accessories/battery/2p-rtc-bat

The Radxa RTC battery provides continuous power to the Real-Time Clock (RTC) chip on the motherboard during power-off, enabling continuous system clock timing and ensuring accurate system time even when the power is disconnected.

https://docs.radxa.com/en/accessories/battery/2p-rtc-bat

[fhanzlik]

Hi, is there or could you please provide a link somewhere to buy this battery?
Or perhaps recommend a compatible type or a battery holder with the appropriate cable and connector?
The battery for the RPi 5 is listed as having a 2-pin JST-SH connector with a 1.0 mm pitch - that is clearly a different, incompatible connector, right?
I’ve also come across many CR3022 laptop batteries featuring a "2-pin, 1.25 mm Molex connector" - but I’m not sure if it matches the connector used in the A7A.

[fhanzlik]

Please excuse a beginner, but I don't know what to make of that comment from giscus[bot]

• in my opinion, it's completely useless.
  I know very well what an RTC battery is used for, and the link provided is the URL where I posted my initial question.

My question is: where can I buy a Radxa (or compatible) RTC battery, or at least the appropriate cable with a connector for the Cubie A7A board?
Thanks, Franta

[tzz-radxa]

Hi Franta, thanks for following up — and apologies for the unhelpful automated comment.

On the connector: the Cubie A7A RTC header uses a 2-pin 1.25 mm connector, and Radxa's RTC battery accessory is a CR2032 cell on a 2-pin XH1.25 mm cable. See:

• https://docs.radxa.com/en/accessories/battery/2p-rtc-bat
• https://docs.radxa.com/en/cubie/a7a/hardware-use/rtc

So your suspicion is correct: the Raspberry Pi 5 battery (2-pin JST-SH, 1.0 mm pitch) is a different, smaller pitch and will not fit. What fits is a CR2032 cell on a 2-pin 1.25 mm (XH1.25) cable — please double-check the polarity against the board silkscreen before connecting.