TAKING THE CPA EXAM ................................................................................... 12. Problems at a Prometric Testing Center.............................................................
Hearing aid batteries last anywhere between five and 14 days depending on the above factors. You will know it's time to replace your hearing aid batteries when the aids start beeping. One solution to save money and make batteries last longer is to purchase rechargeable batteries.
Expect a battery powered CO detector to last about 10 years from the date of manufacture. Expect batteries to last about 3 years. You will know that its time is up when the alarm chirps for no reason, and it's about 8+ years since you bought it.