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UNSCREW THE FRONT PLATE
Take a look at the back of it. There should be a manufactured date printed or stamped in this area (sometimes it's near the battery compartment, instead).
HOW OLD IS YOUR DETECTOR?
If your detector was made more than ten years ago, it's time to buy a new one!
There are number of lithium batteries available specifically designed for smoke and CO detectors. If you need to replace your detector, grab one of these long-lasting batteries at the same time!