Commonly used in small electronics such as flashlights, toys, and smoke detectors, these batteries are cost-effective and environmentally friendly. They have a low self-discharge rate, allowing them to retain power even when not in use - making them ideal for low-drain devices. Carbon zinc is a primary, non-rechargeable battery. This is the main difference between carbon zinc vs alkaline batteries: alkaline batteries typically last longer and offer higher energy density for the same low-drain uses.