One sign of a failing battery is no power, i.e., the phone does not light up or make any sounds. If your phone's indicator lights and back lit keypad are working, or you can hear keypad beeps or alerts, it is likely that the issue is not related to your battery
When a cell phone only powers on when it is plugged into a power source, this can be another sign that the battery is no longer functioning.
All cell phones have some method of indicating when the charging is complete and the battery is at full capacity. If your phone shows this but dies much sooner than normal, it is possible that you need a new battery.
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