It takes a few minutes to shut down and restart the phone, it would sometimes be handy to be able to swap batteries without shutting down (i.e. swap in a fully charged battery before going out). Will the phone operate without a battery while connected to a wall charger? Is it safe to swap the battery without shutting down?
Answer
I just tried this on two phones, a Samsung Galaxy 551 and a Samsung Galaxy S. It doesn't work. The phones typically just shut off. However, one time the Galaxy S didn't shut off right away but I wasn't able to put the battery back in before it shut off. My Google Nexus S is made so that you can't even take the back cover off without unplugging it.
I suspect that this is simply not a supported feature in most phones and that you're not likely to find that it works anywhere. Not to mention the fact that power-loss may damage components or corrupt data. This is one reason why the phone monitors the battery life and shuts down if there isn't enough battery power.
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