When are zinc carbon batteries interesting?

Answer:

Devices with low power needs, such as clocks and thermostats, don’t require an expensive alkaline battery. Zinc-carbon batteries have the characteristic of recovering somewhat after being used. You can see this, for example, when turning of a flashlight after having used it for a long period of time. The light beam becomes weaker after using the flashlight for a consecutive period. However, the light beam becomes better when you turn of the flashlight. An alkaline battery has a more gradually decreasing voltage curve, but will last for a longer period of time.

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