Deep Dive Into rechargeable batteries Everything you need to know

Rechargeable Batteries for LED Torches

Rechargeable batteries are a crucial accessory for LED torches, as they provide the necessary energy to power them. In this blog, we will discuss the different types of rechargeable batteries that are commonly used in LED torches and understand their advantages and disadvantages.

21700 Batteries

21700 Lithium batteries are the latest addition to the world of rechargeable batteries. They have a diameter of 21mm and a length of 70mm, making them larger than traditional Li-ion batteries. This increase in size allows them to hold more energy, providing longer run times for LED torches. Additionally, they have a higher voltage output compared to other types of batteries, making them a popular choice among torch enthusiasts.

21700 batteries are relatively new in the market. Since these battery have become available it has made it easier for Flashlight manufacturers to make lights smaller and more compact and still allowing for the torches to output an extremely high lumen output.

18650 Batteries

18650 batteries have been around for quite some time now and are widely used in LED torches. They have a diameter of 18mm and a length of 65mm, which is where they get their name from. These batteries are compact and can provide high energy density, making them suitable for use in LED torches.

18650 batteries have been the go to battery for all LED rechargeable torches for the past 15 years and have now only recently been replaced with the newer high capacity 21700 Lithium battery. 18650 batteries are a great to have as extra power for led torches when you need to run for long periods of time and you dont have time to wait for batteries to recharge.

14500 Batteries

14500 batteries are smaller in size, with a diameter of 14mm and a length of 50mm. They are commonly used in smaller LED torches due to their compactness. These batteries usually come with a higher voltage output and can provide sufficient energy for smaller torches to function optimally. 14500 are the same size as a Standard AA battery and can be used in most single AA torches. Check the voltage limits before using in a standard AA torch but in most cases these are fine. One main advantage of the 14500 battery over the normal alkaline AA battery is the voltage on the 14500 is 3.7v compared to 1.2v on the alkaline. This extra voltage allows for higher output in small torches or devices using this battery.

16340 battery

16340 batteries are similar in size to the 14500 batteries, with a diameter of 16mm and a length of 34mm. These batteries are commonly used in high-performance LED torches due to their high voltage and energy output. They can provide enough power for torches to reach extremely high lumen outputs and have a longer runtime compared to other smaller battery. These batteries are great for small form factor torches and are fully rechargeable.

Advantages of Rechargeable Batteries for LED Torches

Using rechargeable batteries in LED torches has several advantages. Firstly, it is more environmentally friendly as it reduces the number of disposable batteries being used and disposed of. This helps to reduce waste and minimise harmful chemicals from reaching the environment.

Additionally, rechargeable batteries can save money in the long run as they can be reused multiple times before needing to be replaced. This can be especially beneficial for individuals who use their LED torches frequently.

Furthermore, rechargeable batteries often have a higher energy density and can provide more consistent voltage output compared to disposable batteries. This means that LED torches powered by rechargeable batteries may have longer run times and better performance overall.


In conclusion, the type of battery used in an LED torch can greatly impact its performance and usefulness. While 18650 batteries are larger and may offer better performance for high-powered torches, 14500 batteries are more compact and cost-effective for smaller torches. Regardless of the battery type, opting for rechargeable batteries can have numerous benefits in terms of environmental sustainability, cost savings, and overall performance. When choosing a battery for your LED torch, it is important to consider the specific needs and requirements of your torch and choose the best option accordingly. So, it is always recommended to do your research and make an informed decision when it comes to selecting the right battery for your LED torch. With the right battery, you can ensure maximum performance and longer run times from your LED torch, making it a reliable and useful tool for various purposes. Invest in rechargeable batteries for your LED torches and make a positive impact on both the environment and your wallet in the long run. So, whether you’re using an LED torch for outdoor adventures, household tasks, or emergency situations, choosing the right battery can make all the difference. Consider all factors and options before making a decision to get the most out of your LED torch and its battery.