What size are 18650 batteries?

Ever heard of 18650 batteries? Don't let the number intimidate you. This blog is all about getting to grips with the size of these popular power sources. 

Whether you're a DIY enthusiast, a vaping aficionado, or a torchbearer (literally), understanding the dimensions of 18650 batteries can be the key to supercharging your device usage. So, let's jump into the world of lithium-ion energy and shed some light on this subject, shall we? 

Instead of wading through technical jargon and complex diagrams, we're going to break things down into digestible nuggets of information. Perfect for those who like their knowledge served with a side of simplicity.

Alright, enough with the introductions. It's time to power up your understanding of 18650 battery sizes. Ready? Let's get started.

What Are 18650 Batteries?

Have you ever wondered what those cylindrical power sources in your torches, DIY tools, or vapes are? Well, let me introduce you to the mighty 18650 batteries. These are rechargeable lithium-ion batteries that pack quite a punch! 

Now, the name 18650 may sound a bit odd, but it's actually quite straightforward. The '18' stands for the diameter of the battery, which is 18mm, and '650' represents the length, which is 65.0mm. So in essence, the name is just the size! 

These little powerhouses are widely used, especially when high energy density and long runtime are required. Just think about how long your torch lasts or your DIY tool runs — that's the 18650 battery working its magic. 

The 18650 battery is not much bigger than your standard AA battery. However, it's important to note that despite their similar size, 18650 and AA batteries are not interchangeable. It's all down to their different chemistries and voltage. 

Comparing the 18650 Battery Size with Other Common Batteries 

Let's get down to specifics. A typical AA battery measures around 14.5mm in diameter and 50.5mm in length. So if you're used to those, the 18650 battery is larger and a bit heavier. But if you compare it with a D cell battery, which is about 34mm in diameter and 61.5mm in length, your 18650 seems rather slender. 

Bulking Up: The Weight Factor 

It's not just about length and diameter, though. Weight also plays a part. An 18650 battery will typically weigh in at about 45 grams. That's heavier than a AA battery, which usually tips the scales at around 23 grams. But again, it's lighter than a D cell, which can weigh up to a hefty 135 grams. 

How to Choose the Right 18650 Battery for Your Device

Choosing the right 18650 battery for your device can sometimes feel like navigating a maze. But don't worry, at Fogstar we're here to help you find the perfect battery for your gadget. 

Finding the right 18650 battery really boils down to understanding your device’s needs and matching them to the battery’s specs. Let's delve into this a bit more. 

Understand Your Device's Power Requirements 

First, you should understand the power requirements of your device. Each device, whether it's a torch, a video doorbell, a drill, or a vape, has a specific energy demand. Make sure you know yours! 

Look at the Battery's Capacity 

The capacity of a 18650 battery is measured in milliamp hours (mAh). The higher the mAh, the longer the battery can power your device between charges. However, bigger isn’t always better. If your device doesn’t require much power, a lower capacity battery may be more cost-effective. 

Consider the Discharge Rate 

The discharge rate (measured in Amps) determines how much current a battery can deliver at once. If your device needs a lot of power quickly, like a drill or a vape, you’ll want a battery with a higher discharge rate. But again, if your device has modest power needs, a lower discharge rate may suffice. 

Check the Battery's Size 

And last but not least, confirm the physical size of the battery. As we explained earlier on in the blog, the '18650' in 18650 battery actually refers to its dimensions: 18mm by 65.0mm. You need to ensure your device has enough space to accommodate this size. 

Remember, when choosing a battery, safety should always be your top priority. Always buy from a reputable vendor, such as Fogstar, and avoid batteries with damaged wraps (we have a whole blog dedicated to battery wrapping here).

With a good understanding of your device's needs and the battery's capabilities, you'll be well on your way to choosing the perfect 18650 battery for your device. If you need any help selecting the best battery to fit your needs, just get in touch with our team and we’ll be happy to help you out.