DefiSign AED Batteries
DefiSign AEDs give signals about the battery status. On the left side of the device, you can find 4 lights. Look at the second one from the top. In case it is blinking, it is time to replace the battery.
It is very easy to replace the DefiSign battery. The battery down below is suitable for all DefiSign LIFE AEDs and the Schiller FRED PA1 AED.