I'm willing to bet that all you would have to do is supply AC power to the system while you pop the old battery from its socket and replace it with a fresh one. I can't imagine a design in which the battery would be required while powered up.
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It is possible it will work.
But now I think you can easily replace the battery without interrupting supply. Just solder two wires, connect additional battery and then replace the old one with a new one. Nothing extra necessary.