26650 battery

Due to the rapid evolution of technology, it is becoming increasingly popular lithiumbatteries with high-quality operating characteristics.

One such product is the 26650 lithium-ion (Li-ion) battery developed in 2000.

Technical features of the 26650 battery

This battery is a standard cylindrical battery. Its dimensions are as follows:

1. 26- expresses the battery diameter in mm,
2. 650 - indicates the battery length *0.1 mm (65 millimeters),
3. 3.7 volt voltage.

Energy production, similar to others galvanic power cells, occurs by combining two metals in an electrolyte. This battery uses a lithium-iron-phosphate compound (formula LiFe PO4, or LFP for short).

The batteries have the following characteristics:

1. Constant voltage of about 3.2 V:
2. Operating voltage from 3 to 3.3 V;
3. The highest voltage during a full charge is 3.7 V;
4. Minimum operating voltage – 2.8 V;
5. The lowest voltage during absolute discharge is 2 V.
6. Multiple charge-discharge periods - up to 7000 periods and fixation of up to 80% of the volume
7. High voltage extreme point – up to tens of A;
8. Low self-discharge rate – up to 5% per month at room temperature;
9. Long shelf life – up to 15 years;
10. Large capacity from 2300 to 5000 mAh without memory effect;
11. High temperature resistance, holding energy from -30°C to +55°C;
12. The variable combination of 4 batteries produces a voltage of 12.8 V, which provides the possibility of application in automobiles and the field of solar energy research;
13. Stable temperature, chemical and environmental parameters, which are higher than those of lithium-ion batteries;
14. The 26650 battery has an internal protection mechanism that prevents overcharging, deep charging and high current loads;
15. Small weight about 100 g.

Disadvantages of the 36640 battery:

1. High cost;
2. Storage and charging requirements according to standards;
3. Cannot be used in aircraft;
4. The internal fuse may stop working due to static electricity;
5. Possibility of fire and explosion if used incorrectly;
6. When fully charged, avoid high temperatures (no more than 90 degrees).

What can I use to replace a 26650 battery?

There are no batteries absolutely similar to it in the world.

But the greatest similarity is 18650 batteryIts length is 6.5 cm, almost the same, but the diameter is slightly smaller, 1.8 cm.

With some adjustments: fixing the battery in the mechanism itself and providing electricity, it is possible to use other sizes of 3.7 V batteries for a while. In extreme cases, it is possible to temporarily use an alternating combination of 3 batteries with a voltage of 1.2 V (for example, AA). This will allow the voltage to be generated to 3.6 V, but it will not allow the same large current discharge to be achieved.

Differences between a 26650 battery and an 18650 battery

Due to the difference in size, the main difference between these batteries is the volume of electricity. 18650 battery It's smaller: from 2200 to 3400 mAh. Other parameters of these power sources are practically the same.

Scope of use

Due to its many advantages, the 26650 battery is very popular as a power source for laptops, portable chargers, electric cars, electronic cigarettes, and much more.

The principle of charging 26650 batteries

Battery charging is performed using special charging devices that monitor voltage (from 0.05 to 4.2 V), current (0.5-1 A), and temperature, eliminating the possibility of overheating or spontaneous shutdown.

The voltage must not be allowed to increase above 4.2 V, which leads to anodic metallization of lithium, cathodic oxidation, and further production of carbon dioxide and excess pressure in the battery.

To prevent these processes, a current eliminator is installed in the battery, which detects rising pressure. At high pressures, the energy source becomes flammable and explosive.

This is why you should monitor the temperature when charging the battery and, in the event of a fire, use foam, carbon dioxide, and powder fire extinguishers.

Common brands and their characteristics

Safe use of 26650 batteries is achieved by using materials from common brands. It's best to purchase products from popular brands that feature an internal safety system. Affordable batteries

The 26550 battery production process is extremely high-quality and meticulous. The work requires precise, step-by-step manufacturing, as errors during the manufacturing process can render the battery dangerous to use.
Fenix ​​is ​​considered to be the highest quality brand for the production of 26650 lithium-ion batteries and charging devices. Roboton, Varicore, Keeppower, Soshine, Nitecore, Soshine, Liitokala, Nitecore, TrustFire.

Don't buy counterfeit batteries or batteries from unknown brands. Monitor the battery's quality, check all markings on the device, and examine the brand, voltage, and other specifications.

If you notice any defects on the casing, crackling, or hissing sounds, do not use the battery. Store the battery in a safe, non-flammable location and dispose of it properly.