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18650 batteries with 3.6V / 3.7V 

Be careful with the size of your 18650 battery!

Deviations in the dimensions of the technical products are quite possible. In particular, the cells with a high capacity e.g. B. 3500 mAh often have a diameter a few tenths of a millimeter larger. In addition, all 18650 cells with a protective circuit (PCB) are on average about 2 mm higher in height. You should take a closer look here before buying the 18650 batteries so that you do not experience any nasty surprises later.

18650 battery cells. Wide range of e-cigarette holders from Joyetech, Eleaf, Wismec, Smoktech and more

APV MOD - 18650 Batteries

Li Ion batteries: What should you watch out for when buying a battery online?

Batteries such as a 18650 Li-ion battery and battery packs with protective electronics (PCB) have a higher internal resistance. And, to put it simply, some of the protective electronics can withstand less current than the cell itself. The charging current must also be taken into account here! The appropriate data sheet and technical information must display or specify these parameters, which is why you should study this data carefully.

A special feature: the battery with PCB always has a much greater internal resistance, i.e. H. a fast and high power output is almost impossible here. Many e-vapers can confirm this with the battery of their e-cigarette. This is just one example of why not every cell is suitable for every application. For example, the Panasonic NCR18650BF must not be connected in parallel more than four times. As a rule of thumb you can note the following dependency: "The higher the nominal capacity, the lower the maximum discharge current". For everyone who is interested in the actual capacities and maximum discharge currents, we have created a page with a battery 18650 test. On this page we test lithium ion batteries of the type 18650 from various manufacturers such as Panasonic, Samsung and Sony and give ratings so that you can buy the 18650 batteries you need online in our battery shop.

The operating temperature during discharge is from -20 to 60 ° C for most cells, but charging the 18650 battery only works from 0 ° C to approx. 50 ° C, charging at room temperature is optimal.

The nominal voltages of a 18650 lithium battery

Many think that a battery with a specified nominal voltage of 3.6 volts must not be replaced with a 3.7 V battery. That is simply wrong! A fully charged 18650 battery has a maximum voltage of 4.2 volts. A higher charging voltage would overcharge the cell, with a lower one of e.g. B. only 4.15 volts, the battery guarantees an extremely long service life. The 18650 Li-Ion battery only reaches around 95% of its nominal capacity, but in most cases this is sufficient. In the category of 18650 battery chargers you will find devices with which you can safely charge your new energy storage device. The lowest discharge limit is 2.5 volts. The same applies here: A lower voltage of z. B. 2.8 V extends the service life. A deep discharge (below 2.5V) or overcharging (more than 4.2V) causes lasting damage to the battery cell and can cause it to malfunction! If you have further questions, either read our FAQ section or come to one of our battery shops! Our experts will advise you so that you are sure to buy the right 18650 battery.

FAQ: Which batteries are the best?

You will find many different battery models in our battery shop. For example, an 18650 battery is ideal for e cigarettes, but regardless of whether you are looking for an original or a replacement battery for your purpose, you are certainly wondering which 18650 batteries are the most powerful. Promising results are obtained from the brands of unprotected cell 18650 batteries. So we recommend that you buy a Panasonic, LG, Sony, or Samsung battery. In the case of the protected cells, you must check whether a no-name cell or one of the brands mentioned above was used as the base cell behind the protected accumulator. You can take a look at our test measurements on our test page before buying Li-Ion 18650 batteries.

Please be careful, a Li-Ion 18650 battery with a running time of 5000 mAh hours, for example, is disproportionately high. A cell's cup only has a certain volume that can be filled with chemicals. That would be like owning a 10 liter water bucket and wanting to fill it with 17 liters of water ... oops. At the moment, the maximum capacity of the 18650 battery is 3500 mAh.

What is a 18650 battery?

A battery cell with the technical name 18650 has the dimensions and shape of the battery according to the number. A 18650 Li-Ion battery has a diameter of 18 millimeters and the length of the memory 65 millimeters, while the zero specifies the round shape. Batteries of this type are characterized by the high efficiency of the lithium ions used and are built into numerous products. For example, the battery for e-cigarettes is a popular option.
How many volts does an 18650 battery have?

The single 18650 battery cell has a nominal voltage of 3.6 volts or 3.7 volts. The 3.7v battery is often abbreviated to “18650 3.7v”.

A fully charged cell has 4.2 volts, while discharging it ends at 2.5 volts. 18650 batteries with built-in protection electronics can set the end-of-charge voltage and end-of-discharge voltage lower when charging or higher when discharging. If a cell is discharged below 2.5V, then it is usually defective afterwards and should no longer be charged!
Where can I buy a good 18650 lithium ion battery?

If you want the best advice and the best price-performance ratio, you have come to the right place at Akkuline's online battery shop. Our expert advice makes it easy for you to buy the right batteries. From batteries for cordless screwdrivers to 18650 batteries for e-cigarettes to 18650 batteries with 3500 mAh or other replacement batteries, you will find numerous batteries with us that you can buy online.

How long does a lithium ion battery 18650 last?

Under ideal conditions, a high-quality lithium-ion battery, also known as a Li-ion battery, runs through approx. 500 to 1000 charging cycles. If the 18650 batteries are charged per week, this corresponds to a service life of around 10 years. Exact values can only be estimated in combination with usage and charging behavior.

On batteries there is a mAh indication - the capacity. The unit mAh indicates how much electricity the battery can store. The higher the capacity, the more electricity the battery stores.

In addition, the following factors play a role that have a positive but also negative effect on the life of the 18650 batteries in addition to the mAh unit.

  • the quality of the accumulator and charger
  • the temperature during charging and discharging, room temperature is always optimal, too warm (> 40 ° C) is always worse
  • the end-of-charge voltage, e.g. If only charged up to 4.15V instead of 4.20V per cell, the service life is extended by up to 20 percent
  • the discharge voltage, if the cell is only discharged to 2.7V instead of 2.5V, the service life of up to 20% can also have a positive effect here
  • the level of the charging current and discharge current, if this is exhausted to the maximum, the service life can quickly decrease

Our product range includes a large number of high quality 18650 batteries with a very good price-performance ratio. You also save shipping costs when you buy your battery: From an order value of € 19.99, delivery is free of charge. You can find more information on our blog or personally in a technical consultation in our online battery shop.

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