Final answer:
Primary batteries in low power radio systems are non-rechargeable, power-stable, and contain electrolytes in paste form, making them suitable for devices requiring steady power supply.
Step-by-step explanation:
In fire devices used in low power radio (wireless) systems, a primary battery is utilized for its convenience and reliability. Primary batteries, or dry cell batteries, are non-rechargeable, meaning they can be used until the stored power is depleted, at which point the battery must be replaced. These batteries contain electrolytes in a paste form, ensuring stability and less risk of leakage, making them a general-purpose battery suitable for devices that require a stable power source over time, such as flashlights, transistor radios, toys, and other similar applications.