I solder in a new one. Good for another ten years +/-. You COULD solder in a battery holder, making future replacements a bit easier. However, I don't see many of these systems making it another ten years.
We just avoid dripping on the board. You can mask off areas to give yourself some breathing room - the workspace is not very tight. You could also cut the existing battery off and solder to the current battery leads. Note - do NOT try and solder directly to a battery - bad things can happen.
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