26650 vs. 18650 Battery: Which is better for Electric Tools?

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The 18650 and the 26650 rechargeable battery types are used in multiple applications, from flashlights to vapes, laptops, and even electric vehicles. Despite this, most people wouldn’t realize, as the batteries are often contained in a casing of some kind.

But is the 18650 or the 26650 battery better for electric tools?

The 18650 and 26650 batteries are popular because of their long life, the ability to be recharged hundreds of times, and the high power output they provide. Both battery types use lithium-ion, originally developed in the 1970s.

Let’s dive a little deeper to find out which battery is best.

26650 vs. 18650 Battery: 3 Differences to consider before buying Batteries for your Electric Applications?

As we mentioned, both the 18650 and 26650 batteries use the same technology internally. In this section, we explore some of the more significant differences between the two.

26650 vs. 18650 Battery Size

The figures used to describe the batteries refer to their physical size. A 18650 battery is 18 mm in diameter and 65 mm long, while a 26650 battery is 26 mm in diameter and 65 mm long. The zero at the end simply means the batteries are cylindrical. This extra size allows the 26650 battery to store more electrical charge, and we will discuss this next.

26650 vs. 18650 Capacity and Discharge Rate

We measure battery capacity in mAh. You can buy a 18650 battery from around 1200 mAh to 3600 mAh capacity, while 26650 batteries are available with up to 6000 mAh. In simple terms, the higher the capacity, the longer the battery will last before it needs to be recharged. As with many things, the claims that manufacturers make for their battery capacity may not reflect reality! This is particularly true of cheap copies, which may only provide half or even less than the stated mAh capacity.

The discharge rate is a measure of the maximum power that the battery can provide at a given time. There may be two discharge rates quoted. Maximum discharge rate refers to the absolute full power available, but it may only be available in bursts. Continuous discharge rate refers to the maximum power that can be provided over long periods and is usually much lower than the burst rate.

On the side of the battery, you may see something similar to this:

2500 mAh LiPo 10C

The figures mean the battery has a 2.5 Amp (2500 mAh) capacity, and the 10C means it can be discharged at ten times the capacity, so in this case, at 25 Amps.

26650 vs. 18650 Life

Ultimately, it’s the capacity of the battery that determines the amount of power it can supply. Therefore, if you want a battery that lasts for a long time on a single charge, go for a higher mAh.

How long do 26650/18650 batteries last?

This is not a simple question and depends on a large number of factors. Rechargeable battery life is expressed as the number of recharging cycles. The higher the number of recharging cycles, the longer the battery should last.

If the item you are powering with the battery draws a lot of power constantly, then the battery life will be shortened. On the other hand, a battery that is operating at lower discharge rates and is recharged regularly will last much longer. For this reason, the same battery used in different tools could last for very different periods.

A battery that is running at a heavy discharge rate could need replacing after just six months. Batteries in less demanding situations could last for many years. For this reason, it is better to buy a larger capacity battery than needed to prevent heavy discharge rates.

Are 18650 and 26650 interchangeable?

Based on their voltage and current outputs, yes, the 18650 and 26650 batteries are interchangeable. However, the two battery types are very different in size.

The 26650 has a much greater diameter, so it will not fit in items designed for the slimmer 18650 battery. A 18650 battery will fit in a compartment designed for a 26650 battery, but you will most likely need a sleeve to hold the battery firmly.

Are 26650 Batteries better than 18650?

This is a matter of great discussion in online forums, and there are several reasons why it’s not a simple yes or no answer.

The 18650 battery has been available for decades and has received substantial development, whereas the 26650 is relatively new. For this reason, an excellent quality 18650 will be better than an average 26650 battery.

While the volume of the battery casing itself has increased by almost half again, the battery’s capacity is not always improved by the same proportion. This is partly due to the technology used and the way the cell’s internal components are arranged. The 26650 are often designed for a higher discharge rate, with a reduced total capacity. This creates more heat, and therefore, the battery cells are bigger and have more space around them.

So, in short, buy the battery that offers the power output you need and fits your item’s battery compartment.

18650 Battery Recommendations

Keenstone 18650 battery and charger set

Keenstone 18650 Batteries
Keenstone Universal Charger & 18650 Batteries
4.6
18650 batteries last a decent length of time considering they are rechargeable. Keenstone charger works very well and fast recharges your 18650 batteries to help save money.

The supplied batteries are a 3200 mAh capacity, with a slow discharge rate, making them perfect for occasional use. After 12 months, the batteries should retain around 80% of their initial charge.

The Keenstone multi-battery charger offers two charging slots and comes supplied with eight batteries. It can charge a wide range of battery types, including the 18650.

Tokeyla 18650 battery & flashlight set

Tokeyla 18650 batteries
Tokeyla 4-Pack 18650 Rechargeable Batteries + 5 Modes Tactical Flashlight
4.4
A handy flashlight, USB Charger, and great 5,800mah batteries are what you will get when buying this 18650 battery & flashlight. With $20, this set totally worth its price.

You are supplied with four high capacity, 5800 mAh 18650 batteries, suitable for multiple uses, along with the flashlight. To ensure your flashlight is always available, you will also receive a charger that accepts a wide range of battery types.

If you are looking for a great tactical flashlight, complete with 18650 rechargeable batteries, then the Tokeyla Full Metal could be perfect. The flashlight is made from durable aluminum, water, and shock-resistant and offers five lighting modes.

26650 Battery Recommendations

RBSD 26650 Rechargeable Batteries

RBSD 26650 Rechargeable Battery
RBSD 26650 Rechargeable Batteries
5
RBSD is a new brand, but with not many options available for 26650s nowadays, this high-capacity battery is a solid choice for low to electronic tools: flashlights, vape mods, etc.

The RBSD 26650 rechargeable batteries are designed for outdoor activities: searching, hunting, camping, etc. Each battery offers 7200 mAh of capacity, giving long life, even at high discharge rates.

With 500 recharge cycles, these batteries should offer a long service life, making them worth the premium price.

RENOOK 26650 battery, flashlight, and charger set

RENOOK 26650
RENOOK Rechargable 26650 Batteries, Flashlight & Charger Combo
4.7
RENOOK flashlight has a powerful beam with an adjustable focus feature. The battery life of rechargeable 26650 batteries is excellent as it can stay charged for a whole month. Worth the price!

The high-power 26650 batteries supplied with this set will hold their charge for months without recharging. When in use, the flashlight will give you hours of good light.

By choosing the RENOOK, you will get a good quality water-resistant USB flashlight, a battery charger for multiple battery types, and a 26650, 5000 mAh battery.

The flashlight offers 1200 lumens, which is ideal even for camping, hiking, or keeping in the car as an emergency light because it covers a large area and is very bright.

Tongtai 26650 battery and 90,000 lumen flashlight set

Tongtai 26650 Batteries
Tongtai 26650 Batteries + LED Flashlight
4.5
The Tongtai set comes with a capable, super-bright, 90000 high lumen, LED flashlight; and two 26,650 mAh lithium-ion batteries, whose casing is aluminum alloy. It’s totally worth the price!

Each of the two supplied 26650 batteries has a capacity of 5000 mAh, giving plenty of life, even when the torch is in a high-power setting.  The batteries can be recharged through the flashlight USB port, so a separate charger is not required.

The Tongtai TacticalFlashlight offers a massive 90,000 lumen, using its 26650 rechargeable batteries to significant effect. The torch is waterproof, provides five modes, and has a zoom function.

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