Can a Battery tester tell how long a battery is going to last?
Many people think that a battery tester will tell you how long the battery would run. It is not true for Zinc-Air batteries. The battery tester for Alkaline batteries may tell you how long a battery would go, as the discharge curve of an alkaline battery is very steep. However, zinc-air batteries have a very flat discharge curve. Zinc-air discharges for a long time at flat voltage and then expires suddenly. Accordingly, the ending date cannot be anticipated by using a battery tester. Battery testers may only tell you if the battery is good or already discharged. Each hearing aid battery has its own characteristics per manufacturer. A battery could have low voltage measured with the tab on, or right after the tab is off and be judged as dead when it is tested. Once again, low initial voltage has nothing to do with the performance of the batteries as the voltage goes up high enough to perform to full capacity after enough activation time. * Caution. Some cheap testers, especially with la
