I'm ready to change my smoke alarm battery – what replacement batteries can I use?

Check your User’s Manual or the nameplate on the back of the alarm. Different smoke detectors use different kinds of batteries – 9V, AA, AAA – it all depends on the particular model you have. Use quality batteries like lithium smoke detector batteries – having plenty of power is worth any extra cost. Never use rechargeable batteries because they may not always provide a consistent charge.