Alkaline batteries and carbon batteries (full name is zinc carbon battery) are widely utilized as primary batteries, which are non-rechargeable. The significant feature that sets them apart is their composition and performance capabilities.
| Attribute | Carbon zinc battery | Alkaline battery |
| Positive electrode | manganese dioxide mixed with carbon powder | manganese dioxide (MnO2) |
| Negative electrode | zinc (Zn) | zinc (Zn) |
| Electrolyte | Ammonium chloride (NH4Cl) | Potassium hydroxide (KOH) |
| Nominal Voltage | 1.5V | 1.5V |
| Capacity | Small | Large, up to 8 times |
| Price | Cheaper | 1.5-2.0 times higher |
| Lifespan | 18 months | 3 years |
| History | Longer, can be traced back to 1866. | Shorter, come into market since 1950s. |
| Safety | The shell is made of zinc and is also a part of the negative electrode, so it is prone to corrosion by the electrolyte and leaks over time. | The shell is made of steel and minimizes the risk of electrolyte leakage. |
| Environmental Impact | Contains cadmium and mercury, not good for environment protection | No mercury, less harmful |
| Applications | It is used to power low-power devices such as remote controls, toy cars, etc. | It is used to power devices long-term, for example, cameras, MP3 players, etc. |
A zinc–carbon battery (or carbon zinc battery in U.S. English) is a dry cell primary battery that provides direct electric current from the electrochemical reaction between zinc (Zn) and manganese dioxide (MnO2) in the presence of an ammonium chloride (NH4Cl) electrolyte, it is also known as a zinc-manganese battery. The carbon is added to the Positive electrode to increase conductivity and retain moisture; it is the manganese dioxide that takes part in the reaction, not the carbon.
The alkaline battery gets its name because it has an alkaline electrolyte of potassium hydroxide (KOH) instead of the acidic ammonium chloride (NH4Cl) electrolyte of the zinc–carbon batteries.
The key differentiating factor between a zinc-carbon battery and an alkaline battery lies in the type of electrolyte employed in each. Zinc-carbon batteries, for the most part, contain ammonium chloride (NH4Cl), whereas alkaline batteries utilize potassium hydroxide (KOH) as their key electrolyte component.
Zinc carbon battery is the first to enter the battery market, its prototype, acid zinc manganese was invented and patented by the French scientist Georges Leclanché in 1866, so it was also called Leclanche battery.
The contemporary alkaline battery, which utilizes the zinc/manganese dioxide chemical composition, was developed by Lewis Urry, a Canadian engineer, in the 1950s. On October 9, 1957, Urry, along with Karl Kordesch and P. A. Marsal, submitted a US patent (2,960,558) for this innovative battery. It was eventually granted in 1960 and assigned to the Union Carbide Corporation.
Both alkaline and zinc carbon batteries typically generate 1.5 volts of electrical potential when brand new.
The capacity of an alkaline battery is typically 4 to 5 times greater than that of a zinc carbon battery, while its price is typically 1.5 to 2 times higher than zinc carbon batteries.
Zinc-carbon batteries are frequently utilized for low-drain appliances such as remote controllers, clocks, and flashlights that are only occasionally used or require low power. Meanwhile, alkaline batteries are more appropriate for high-drain devices such as digital cameras, toys, and portable audio equipment.
Although alkaline batteries offer numerous benefits, their use may not be appropriate in every situation. For instance, quartz watches are not suitable for alkaline batteries. This is because these watches require only a small amount of current to function and using alkaline or rechargeable batteries can damage their mechanism, resulting in inaccurate timekeeping or even burnout of the movement.
Alkaline batteries are considered less harmful to the environment compared to zinc-carbon batteries, as they contain fewer toxic materials. However, both types of batteries should be disposed of properly to minimize environmental impact.
Alkaline batteries is identified as LR, such as “LR6” for AA alkaline batteries. ordinary dry batteries is identified as R, such as “R03” is a high-capacity type No. 7 ordinary battery. In addition, alkaline batteries will be marked with “ALKALINE”, while it is common to find the phrase "heavy duty" printed on zinc carbon batteries.
In the same type of battery, alkaline batteries are generally much heavier than zinc carbon batteries.
In summary, alkaline batteries generally offer higher capacity, longer shelf life, and better performance in high-drain devices compared to zinc carbon batteries. However, zinc carbon batteries can be a more cost-effective option for low-drain devices.
