It takes 4 × CR123A: a camera & alarm battery, short and chunky, about 3.5 cm long.
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You’ll need: None
Slide or unscrew the little battery door.
Take out the old one and put the new one in matching the “+” mark.
Close the door and switch it on.
Replace all four cells at once with fresh ones from the same pack.
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A new battery usually lasts about 2 years in this device.
That’s around November 2028.
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It takes 4 × CR123A, a camera & alarm battery.
Yes. DL123A, EL123AP, 123 are the same battery with other names.
Usually about 2 years, depending on how much you use it. Most devices warn you when it gets low.