this post was submitted on 18 Dec 2025
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IIRC from various board schematics at a previous job, typically you have the battery connected into the relevant voltage supply with a diode. So when that Vcc line for your memory module or real time clock is powered externally, the battery just sits idle since there's no voltage drop across the diode to get current flowing from the battery.
It works well because it's analog and fast and solid state. And yeah as long as you don't bump other parts or break something, if you swapped the battery on a powered system it should be fine.