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7 5. Test smoke alarm for proper operation (see ”WEEKLY TESTING OF YOUR SMOKE ALARM” section). The smoke alarm operates on a 9-volt battery. The normal battery operating life will be one (1) year. The life of some batteries may be less. 6. Firex smoke alarms sold with Ultralife long-life lithium batteries require replacement approximately every ten (10) years. Replace the battery approximately every ten (10) years or when the low battery signal sounds. !CAUTION: YOU SHOULD ONLY USE THE BATTERIES