Best 20700 Batteries: Safer, Efficient, Longer-Lasting
20700 batteries have overtaken the standard 18650 batteries as the power source of choice for most new-generation mods. They are efficient, durable, and have decent power output. Devices that operate with 20700 include the Innokin Oceanus (which included cells in the kit) and the iJoy Genie, as iJoy also makes the batteries.
IJoy 20700 battery
10/10 Review score
Nominal Voltage: 3.7V
Peak Voltage: 4.2V
Cut-off Voltage: 2.5V
The iJoy 20700 cell is a continuous-discharge cell with a 3000mAh capacity. It can discharge at a max level of 40A, while its highest pul...
The iJoy 20700 cell is a continuous-discharge cell with a 3000mAh capacity. It can discharge at a max level of 40A, while its highest pulsing discharging rate is 85A.
The cell measures 20mm in diameter and 70mm in length, which is why it is called a “20700” battery. The iJoy cell is compatible with high-wattage devices running in series or parallel. Users can install one or two cells into any triple-digit wattage mod and get excellent battery life.
The Mahero 20700 cell has a maximum discharge rate of 40A and is well-suited for both regulated mods, as well as unregulated mods.
This cell has a capacity of 3000mAh, so a single battery can power a sub-ohm coil build for about four hours at 100W. The cell has a maximum pulse charge of 85A so it can work well with Boost or pre-heat modes on most modern mods.
The EBAT 3000mAh battery has a max discharge rate of 40A, which makes it compatible with the parameters of most high-wattage devices.
The battery features a flat-top like most EBAT cells, but this one features a colorful blue wrap. The cell also features a low-voltage output of 3.7V, which keeps in line with most of the other cells in this line-up.
This cell works well with several mod types, from regulated to unregulated mods.
The Shockli cell is a high-current battery that is larger than most other 20700 batteries. This cell has a maximum discharge rate of 40A, while its lowest discharge rate is 30A.
It has a low-voltage output of 3.7V and an internal capacity of 3200mAh. The cell has a leak-proof construction to prevent battery venting. A protective ring at the base prevents short-circuiting as well.
Batteries are essential elements for the smooth and safe operation of any vape mod. The 18650 battery was the most common cell on the market at the time vapes started emerging.
Single-cell devices were the norm, but vapers wanted more power, so vape makers started making dual, triple, even quad 18650 battery devices.
With 20700 and 21700 cells, though, a single battery is enough to power a high-wattage, high-drain device, be it regulated or unregulated.
Of course, these new battery types won’t work in those 18650 devices. Still, manufacturers have started to build mods around the parameters of the original cell type, while also including adapters so users can install their 18650 batteries as well.
How To Choose the Best 20700 Battery
Choosing the right battery for your rig is something only sub-ohm or mech mod vapers need to worry about. These are the only devices that have removable cells, and that requires a lot of juice to work. Other accessories like pod mods or AIOs do not have those concerns as the battery you get in the device is the only one you get.
Important specifications to check:
The manufacturer is another important consideration. While a majority of brands make safe, reliable cells, the fact that a battery can be wrapped, or re-wrapped, means that some vendors can take low-quality, malfunctioning cells and cover them, so they look like new. Always buy from trusted vendors that have a good reputation.
Also check test reports from online sources like the Battery Mooch or this site that test a variety of electronic equipment, including batteries and chargers.
They all use professional equipment and publish unbiased reviews of all kinds of cells, while also explaining their findings in layman’s terms so everyday users can understand them.
18650s vs. 20700s
18650 batteries – “18650” refers to its dimensions 18mm x 65mm – were and still are the go-to cell for modern-day vape mods.
The capacity of each cell can vary, but the typical range is 2500mAh and 3000mAh. Because of their limited capabilities, high-drain, high-wattage devices typically require more than one cell to perform at an optimal level.
18650 batteries are also found in many everyday electronic devices like laptops, flashlights, power tools, and e-bikes.
21700s vs. 20700s
21700 batteries benefit from a larger size, which means that they have a higher power capacity for high-drain, heavy-duty electronics from power tools to electric cars, and even e-cigarettes.
The other benefit of a 21700 is that it can power smaller, more portable vape mods, so users are not burdened with heavy, ungainly vape mods that take two or three regular 18650 cells.
FAQ about 20700s
How long to charge 20700 battery?
Charging time for a cell like this depends on a lot of factors, like the battery’s capacity and the amperage of the charger you are using.
For a cell that has a capacity of 2500mAh and a charger that charges at 500mA/hour, charging time can take about three hours.
How long does a 20700 battery last?
A fully-charged 20700 cell can have various durations depending on usage. A single-cell in an unregulated mech mod can last for a few hours with heavy use, or last all day with light to moderate use.
How to re-wrap 20700 battery?
A cell may need a new wrap if the original covering has a tear or other damage. This is dangerous given that the battery body may come in contact with a metal object that can lead to a short.
Re-wrapping a cell is not complicated and requires the following:
New battery wraps (PVC in sheet form or pre-rolled)
A heat source (usually a hairdryer will suffice)
First remove the original wrapping with their tweezers, and if they have pre-rolled tubes, they can slip it onto the cell.
Once it is in place, users can blow hot air over the entirety of the battery, so it sticks to the body.
Only apply as much heat as you need.
Using too much heat can melt the wrap. Before you meld the cover to the battery body, you can place an insulator on one end to keep the battery from leaking.
How many amps are in a 20700 battery?
Calculating the amperage of a battery can take many forms. You can use Ohm’s Law to determine the amperage you are drawing from a cell by using a formula with variables like:
To get the amperage of the cell, plug in the resistance of your coil and the voltage coming off of the battery, which will then give you the amperage. Every 20700 battery has the nominal voltage written on the wrap. An IJoy battery, for example, can put out 40Amps.
For a sub-ohm coil build of around 0.5ohms, you can use the formula:
I = V/R
To find out the amps that the cell is outputting, by inputting both the resistance and the voltage you are vaping at, which, for this example, can be 10.5V, which would give you 10.5/0.5=21A.
Where can I get a battery charger that works with IJoy 20700?
You can buy a charger for your IJoy 20700 batteries directly from IJoy, as well as any reputable vape supply store or online retailer.
How low can you build with a 20700 battery?
The lowest resistance possible to use in conjunction with a 21700 battery depends on what Ohm’s law has to say for unregulated mods.
Regulated mods use a different formula. Watts’ law determines how low a build can be in terms of wattage.
If you have variables like the amperage and voltage, then you can also use Ohms law to calculate the appropriate resistance for your builds.
What is the continuous output on an Ijoy 20700 battery?
For an IJoy battery that has a max discharge current of 20A and a low-voltage output of 3.7V, the cell can match the high-wattage output of the attached mod. A 220W mod, for example, can output 3.7V but not for long as the battery will lose power immediately, even after only a few puffs.
When using a high-wattage, high-drain device, it is best to vape at lower wattages to conserve battery power and to not overtax the battery.
A 20700 battery with a continuous discharge of 40A can output for an extended period, even within the 65-80W range.
How many volts does a 20700 battery put on mech mod?
A 20700 cell has a working voltage range between 2.75V and 4.2V, which lowers after the device is in use.
A typical 20700 battery has a nominal or average voltage output of 3.7V, much like the cells listed here.
What is the best 20700 battery?
There are many variations of battery brand but the most trusted brands – that is, the brands that manufacture their proprietary batteries rather than re-wrap cells from battery makers – are LG, Samsung, and Sony.
Other brands take these batteries and wrap them in their label, which is a common practice, but just make sure that they come from a reputable site that sells authentic batteries, not knock-offs.
Have you used a 20700 mod, regulated or unregulated? Have you noticed a difference between using a dual or triple 18650 devices and a single 20700 mod? Tell us what you think in the comments section below.
20700 batteries are relatively new in the vaping field, but they seem to be the way of the future. The simple reason is that you can get more – power, performance, battery life – from a single 20700 cell than two or three or four 18650 cells. This energy efficiency also means that users can vape on high-powered mods that are smaller and more portable in size than the traditional and hefty triple-18650 device.
Published: March 20, 2020Updated: April 14, 2020
I was a smoker for over 25 years. In this time I also earned my medical degree with a specialization in addiction treatment and counseling. That period has led me to vaping, my interest started around 2011. I’m fighting the tide of hysteria and dis-information around vaping that emanates from various fronts legislative, cultural and scientific. Having scientific councils support, I’m happy to contribute my thoughts, articles, and expertise.