I would say a battery is not needed.

The clock chip is the only device on the board that has a volatile memory and the current required to keep the data in place is very low. With the capacitors on the PCB the time should be maintained over a month. This is something we can test however it would be difficult to obtain an exact time to live because when you power up to read the clock the caps will be recharged.

Assuming it will be possible to set the time shortly before launch or even after launch it will be best not to have the added burden of a battery.

Bob

On Apr 16, 2024, at 2:18 PM, Bill Reed via pacsat-dev pacsat-dev@amsat.org wrote:

Should the blinky RTC have a battery?

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