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The batteries in AED units are mostly a solid disposable pack, there are some exceptions that use 10 small batteries. AED units are all battery powered and never mains or rechargeable. The HeartSine AED units have a battery built into the pad cartridge which makes it easy to ensure the unit is always ready to use.
The shelf life of the batteries vary from 2 to 5 years. Make sure when you check an AED that the batteries are all charged and able to be used. If there is a problem or they need replacing, the AED will alert you by a beep or light. Even when the unit says the batteries need replacing, you can still use the unit in an emergency.