Pencil Cell Battery with Charger: The Ultimate Guide

Pencil Cell Battery with Charger: The Ultimate Guide

Auth Anushka Agarwal | Jan 28,2021

Batteries power every device we use every day or occasionally. 

Don’t believe it?

Well, think about all the devices you use indefinitely: clocks, trimmers, remotes, laptops, phones, and toys. 

What is the connecting thread amongst all these devices: they all run on batteries! 

More so., with our depleting fossil fuel reservoirs, even the transportation industry revolutionizes as per battery technology. 

So, what do we realize and understand?

The future belongs to the battery and its innovations. 

Plus, they’ve become an integral part of our lives. 

We’re so dependent on batteries that we all have a spare pack just in case its stored power gives up late at night. Or, you can opt for a pencil cell battery with a pencil cell charger, and rest assured. 

Irrespective of why and when., we all need batteries, hence the billion-dollar market. 

This guide covers:

  • What is a pencil cell battery?
  • The different types of pencil cell batteries: primary and secondary  
  • Types of secondary batteries: Nickel-Cadmium, Lithium-ion, Nickel-metal hydride, and Lead-acid 
  • How to select the right pencil cell battery: energy density, power density, cost, safety, and lifecycle durability 

What is a pencil cell battery?

A pencil cell battery is a stored energy solution used to power devices. Since its construction resembles a pencil, we call it a pencil cell battery. 

These batteries come in various sizes: AAA, AA, C, and D. D -size battery is the biggest, and AAA is the smallest. The easiest way you can remember is; the farther the alphabet, the bigger the size. In the case of AA and AAA., the latter is larger than the former. 

Why are there different battery sizes?

Well, because different devices have varied power needs. 

Consider it this way:

The bigger a pencil cell battery, the more its power storing capability and vice versa. So, depending on the power requirement, devices require a specific battery size. 

The different types of pencil cell batteries

Mainly, batteries fall into two types:

  • Primary batteries
  • Secondary batteries

Primary Batteries:

In simple words, these pencil cell batteries are non-rechargeable. It means, once they run out of their juice, they are of no use, and that’s their fate. In technical words, primary batteries consist of an irreversible electrochemical reaction. 

These batteries exist in different sizes., from coin-shaped to AA, AAA, C, and D variants. They assist standalone applications, have high specific energy, and consists of a low-power consuming design. That means these batteries are perfect for low power intake devices. Some examples of such batteries include remote controls, watches, smoke alarms, etc. 

The most common primary batteries are alkaline ones. They are cost-effective, do not require a pencil cell charger, non-leaking, and broadly supportive. Since these batteries have a low self-power discharge rate, you can store them for some years. Their only disadvantage: low load current, which limits their usage. 

Secondary batteries:

In simpler words, secondary batteries are rechargeable. It means you can use them over and over again, once recharged using a pencil cell charger. 

In technical words, secondary batteries can reverse the electrochemical reaction post applying a specific voltage to it in a reversed direction. Also called rechargeable batteries, these require a pencil cell charger for such a reverse reaction to happen. They find use in high load current devices, which is why they can power portable devices like mobile phones, cameras, trimmers, and other heavy-duty appliances.

Secondary batteries further sub-divided into:

  • Nickel-Cadmium batteries
  • Lithium-ion batteries
  • Nickel-metal hydride batteries
  • Lead-acid batteries 

Types of secondary pencil cell batteries

As mentioned before, secondary pencil cells are of four types:

Nickel-Cadmium Batteries:

A type of rechargeable battery, they develop using nickel oxide hydroxide and metallic cadmium as electrodes. These batteries offer high voltage and excellent holding charge when not in use. Unfortunately, nickel-cadmium batteries are an easy victim to the dreaded memory effect when a partially charged battery is recharged again., decreasing its overall future capacity to hold a charge. 

Ni-Cd batteries offer a reliable life cycle and performance at optimum temperatures. 

But, that isn’t their prominent advantage. 

Their ability to deliver full-rated capacity at high discharge rates suffices that requirement. They are available in standard battery sizes, in a pack of two or more cells. 

Although Ni-Cd batteries offer superlative performance and high customer convenience, these batteries include cadmium, a dangerous and harmful element. More so, once rendered useless, disposing of cadmium in the environment results in air, water, and land pollution. 

Nickel-metal hydride batteries:

Nickel-metal hydride pencil cell batteries are a successor to the Ni-Cd ones. These modern rechargeable batteries enjoy attention from several brands, developing better products with high recharge cycles. The only difference between Ni-MH and Ni-Cd is, in the latter, the negative electrode is nickel-metal hydride, a self-absorbing alloy, instead of cadmium. Plus, Ni-MH possesses 2-3 times the capacity of a Ni-Cd battery of the same size. Not only does it ensure environmental sustainability, but it makes such batteries a perfect energy storage solution. 

Ni-MH batteries attend to the high-drain energy needs of appliances owing to their high capacity and energy density needs. Unlike their predecessors, the Ni-Cd batteries; aren’t susceptible to the memory effect depleting its recharging capacity. Once discharged, these batteries require a pencil cell charger for recharge. 

Lithium-ion batteries:

These are the most popular types of batteries, popularly known as e laptop and mobile phone batteries. However, our modern need now requires its integration into automobiles, forming battery-powered vehicles or Electric Vehicles. These portable batteries use lithium for construction and are extremely lightweight. They find use in aerospace and military applications and other popular electronics. 

A fun fact for tech lovers: these rechargeable batteries contain lithium-ions as anode and cathode with the ions moving from one electrode to the other, reversing the direction when recharged. These batteries consist of intercalated lithium compounds as the electrode material, unlike metallic lithium used in non-rechargeable pencil cell batteries. 

Lead-Acid Batteries:

These heavy-duty batteries find usage in solar-panel energy storage, vehicle ignition and lights, backup power, and load leveling in power generators. Based on the oldest rechargeable battery technology, lead-acid batteries are still very relevant in today’s market. They have low energy to volume and energy to weight ratio, hence powerful enough to supply huge surge currents when needed. Their low cost and easy availability support several high current applications. 

How to select the right pencil cell battery for your application?

After a draining session about the different battery types, it’s time to head over to the other section: how to buy the right battery for your use?

With connected devices becoming a reality, battery life is a concern for manufacturers. Modern batteries must provide long life and smart power management to become worthy of consumer selection. A compatible pencil cell battery isn’t selected by brand name but the desired outcome it provides. Recharge cycles have become a predominant factor for users when choosing one variant over the other. 

Such actions necessitate the need for batteries that accomplish the following characteristics:

Energy density:

It is the total energy stored per unit mass or volume. In layman’s words, it determines how long your device stays active before it needs a recharge. The higher the energy density of a battery, the more are its buyers. 

Power density:

It is the maximum rate of energy discharge per unit mass or volume. A device should have a low power density to make it big in the consumer market. That means it discharges energy slowly and supports action before it needs refueling. 


The battery you buy depends on its end device. The appliance must support the battery configuration, or else the results can be dangerous. More so, check the device temperature. At high degrees, some battery components might breakdown due to an exothermic reaction. Moreover, high temperatures reduce the performance of the battery.

Lifecycle durability:

The battery chemistry must support consistent discharge and recharge cycles. That is what empowers long-lasting battery life. 


Well, of course, the cost is always an imperative factor in any purchase. So, look for pencil cell batteries that offer more at a lower price. 


Buying a pencil cell battery is a personal decision. However, consider all factors before you decide. Hope this guide educated you about different battery types and functions. 

Which brand’s battery do you prefer? Let us know in the comment section

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