9 Buying Guides for 26650 Lithium Batteries
Ten very good suggestions！
Table of contents:
- 26650 Lithium Battery Buying Guide Overview
- Introduction of 26650 lithium battery
- 26650 lithium battery parameters
- Features of 26650 lithium battery
- 26650 purchase precautions
- 26650 lithium battery price
- Where to buy 26650 lithium battery
- The difference between 26650 lithium battery vs 18650
- 26650 lithium battery charger
- The safety of 26650 lithium batteries using different materials
1、Overview of 26650 Lithium Battery Buying Guide
When we buy a 26650 battery, we should pay attention to its positive electrode material, parameters, characteristics, safety, and the difference from other types of batteries, and of course the price and place of origin that everyone cares about most.
2、Introduction of 26650 lithium battery
（1）Definitions
26650 lithium battery is a model specification of cylindrical lithium battery. The definition rule of its model is: 26650 type, which means that the diameter of the battery is 26mm, the length is 65mm, and the battery is cylindrical.
（2）Dimensions
The diameter of the battery is 26mm and the length is 65mm
（3）Material
Lithium iron phosphate material, ternary lithium material
26650 lithium battery cathode materials include lithium cobalt oxide, lithium manganate, nickel-cobalt-aluminum ternary, nickel-cobalt-manganese ternary, lithium iron phosphate, etc. The material system determines the characteristics of the battery’s working voltage and unit capacity. Various material manufacturers and battery cell manufacturers improve the overall battery voltage and capacity by adding special substances into the material, coating process, and manufacturing process improvement. ,
Various materials themselves will determine the cycle life of the battery, and the manufacturing level of the battery manufacturer will also affect the life.
（4）Voltage, capacity (single battery)
Under normal circumstances, the working voltage and theoretical gram capacity of various materials are:
The theoretical capacity of lithium cobalt oxide 3.6V is 274mAh/g
The theoretical capacity of lithium manganate 3.7V is 148mAh/g
The theoretical capacity of ternary material 3.65V is 278mAh/g
LiFePO4 3.2V Theoretical capacity is 170mAh/g
IFR26650 lithium battery capacity includes 2800mAh, 3000mAh, 3200mAh, 3400mAh, 3600mAh, 3800mAh and 4000mAh.
The capacity of INR26650 lithium battery tends to be 4500mAh, 5000mAh, 5500mAh and 6000mAh.
（5）Purpose
Used in power tools, lighting, wind and solar energy storage, electric vehicles, toys, instrumentation, ups backup power supply, communication equipment, medical equipment and military lights.
（6）Advantages
High energy density: The theoretical specific capacity is 170mAh/g, and the actual specific capacity is ≥140 mAh/g (0.2C, 25°C);
High safety: the safest cathode material for lithium-ion batteries at present;
No pollution: does not contain any heavy metal elements that are harmful to the human body;
Long cycle life: under the condition of 100% DOD, it can be charged and discharged more than 2000 times;
3、26650 lithium battery parameters
Cycle performance: 2000 times (1C charge/1C discharge, capacity retention rate ≥80%, 100% DOD) Maximum continuous discharge current: 9.6A
Pulse discharge current: 15A, 5s
Operating temperature: Charge: 0°C ~ 55°C; Discharge: -20°C ~ 60°C
Storage temperature: -20°C ~ 45°C
Battery weight: 86 g (approx.)
Nickel-cobalt-manganese ternary lithium-ion 26650 single-cell nominal voltage is generally: 3.6V
Nominal capacity: 4500mAh (capacity range 4500-4650mAh)
AC internal resistance: ≤30mΩ (plus PTC type)
Charging conditions: cut-off voltage 4.2±0.05V, cut-off current 0.01C. (Note: Charge with 0.5C constant current to 4.2V, and charge with constant voltage until the current drops to 0.01C and cut off)
Discharge cut-off voltage: 2.75V
Cycle performance: 500 times (1C charge/1C discharge, capacity retention rate ≥70%, 100% DOD)
Maximum continuous discharge current: 13A
Pulse discharge current: 15A, 5s
Operating temperature: Charge: 0°C ~ 55°C; Discharge: -20°C ~ 60°C
Storage temperature: -20°C ~ 45°C
Battery weight: 92 g (approx.)
Diameter: 26.2mm
Height: 65.6mm
4、Features of 26650 lithium battery
（1）Size and application field: 26650 lithium battery is a type and specification of cylindrical lithium battery. The battery size is 26mm in diameter and 65mm in length. It is suitable for flashlights, instruments, medical equipment, outdoor power supplies, power tools, security monitoring, exploration and mapping, and special equipment.
（2）Material system: 26650 lithium battery is mainly divided into two types: ternary material and lithium iron phosphate material
26650 of the ternary material system: marked as INR26650 lithium battery nominal voltage 3.6V, full charge voltage 4.2V, discharge cut-off voltage: 3.0V INR26650 lithium battery capacity is generally 4500mAh, 5000mAh, 5500mAh relatively more.
26650 of lithium iron phosphate system: IFR26650 lithium battery nominal voltage 3.2V, full charge voltage 3.65V, discharge cut-off voltage: 2.0V IFR26650 lithium battery capacity includes 2800mAh, 3000mAh, 3200mAh, 3400mAh, 3600mAh, 3800mAh, 4000mAh, etc. capacity segment. The 3.2V2500mAh battery is specially designed for high current discharge, supports 30C discharge and instantaneous 50C discharge, and is the first choice for various starting power sources.
5、26650 Battery Purchase Notes
（1）Appearance and Packaging
Regular manufacturers will take into account not only good quality of products, but also details such as appearance and packaging. First of all, check whether the size is correct, whether the outsourced PVC is complete, whether there is any damage, etc., the whole is clean and tidy, the hand feels comfortable, and whether the insulation is done well.
（2）Clear and complete performance parameter identification
The products of regular manufacturers must have basic performance parameters. The logo is very clear and can be understood by ordinary consumers, such as brand trademark, voltage capacity, production date, and traceable QR code. On the contrary, the unlicensed and unmarked 26650 lithium battery is likely to be a garbage battery reassembled with inferior battery cells or recycled battery cells. There are many cheap 26650 lithium batteries on the market. They are made of recycled battery cells or disassembled battery cells. Although the price is cheap, the lifespan is short and the quality is unstable. Careless use may damage the device or even explode. Those with ultra-high capacity, ultra-low prices, not in line with the norm, most of them are fakes.
（3）Is there circuit protection
Under normal circumstances, the 26650 battery must be used with a protective plate to prevent overcharging and overdischarging. Without the protective plate, the 26650 battery is at risk of deformation, leakage and explosion. After adding the protective plate, the size will be increased. Under normal circumstances, customers are recommended to purchase protected 26650 batteries.
（4）Weight and Quality Aftermarket
General 2660 battery regular manufacturers have a delivery inspection report when they leave the factory, and there will be batch related content, voltage, capacity, and battery size, weight, etc. This report can be checked accordingly. Generally, if 26650 is a lithium iron phosphate system, it is about 80 grams. The ternary material system is 86-92 grams right. Good battery consistency is very good. Regular manufacturers will promise corresponding after-sales service.
6、26650 lithium battery price
The following 26650 lithium battery prices are for your reference:
IFR26650-2500mAh lithium battery price: 12.5 yuan/pc.
IFR26650-3300mAh lithium battery price: 12.8 yuan/pc.
IFR26650-3000mAh lithium battery price: 10.2 yuan/pc.
7、Where to buy 26650 lithium battery
Go to 26650 battery to buy
8、26650 lithium battery vs 18650 lithium battery
（1）The rated capacity is different: the rated capacity of the IFR26650 lithium battery is 3000mAh, and the rated capacity of the IFR18650 lithium battery is 1100~1400mAh.
（2）The two cells have different diameters: the IFR26650 is 26mm in diameter and the IFR18650 is 18mm in diameter.
（3）The reference mass is different: the production test mass of IFR26650 lithium battery is 94 grams, and the production test mass of IFR18650 lithium battery is 45 grams.
（4）Different battery size: 26650 is larger than 18650, their cell height is the same, and the cell diameter is different. The 26650 cell diameter is 26mm, while the 18650 cell diameter is 18mm.
（5）Different battery capacity: The battery capacity of 26650 is larger than that of 18650 under the same battery material. Assuming that the 26650 battery with the same ternary material is generally around 5200mAh, the capacity of 18650 battery is mostly around 2600mAh.
（6）Different application environments: 18650 lithium batteries are used in lighting lamps batteries, industrial supporting lithium battery packs, power tool batteries, electric bicycle batteries, power lithium battery packs, etc., while 26650 lithium batteries are used in integrated solar street light lithium battery packs, There are many energy storage stations, solar energy storage batteries, etc.
（7）The battery life is different: 18650, which means straight 18MM, height 65MM, in this way, 26650 must be larger than 18650, so there is more space to fill materials, so as to achieve larger capacity, the current capacity of 18650 is 2200, 2600, 3100MAH, etc., while the capacity of 26650 is generally 4000, 4200, 4500MAH, and the battery life will be longer.
The above is a detailed explanation of the difference between the 26650 lithium battery and the 18650 lithium battery. The 18650 lithium battery and the 26650 lithium battery are also completely different, but they can be modified with each other, but there are differences. You can bold the 18650 battery and put it into a 26650 flashlight.
Combined with the excellent capacity characteristics and high consistency of the 26650 lithium battery, as well as the excellent structural design and mature manufacturing practice of the cylindrical battery, the 26650 lithium battery will gradually replace the 18650 lithium battery in the application of power batteries.
9、26650 lithium battery charger
（1）How many volts does the charger use for 4 26650 lithium batteries?
26650 lithium battery generally has a rated voltage of 3.6V, a capacity of 2.6Ah 2s2p, a total voltage of 7.2V, and a total capacity of 5.2Ah. It is recommended to use a 3.6V/7.2V—2.6A charger
（2）
How big is the charger for the 26650 battery?
The 26650 battery is a cylindrical lithium battery with a rated voltage of 3.7V, with a capacity of about 5000MAH. The charging current of lithium batteries is generally controlled at 1C, that is, the charging current of 26650 batteries with a capacity of 5000MAH is 5A, which can ensure the safety and fullness of charging.
If time permits, reducing the charging current is good for the battery, not to mention the high fullness, it is good to prolong the battery life.
If the quality of the battery is guaranteed, it can be discharged at a high rate, and the capacity is not false, and the charging current can be appropriately increased. For example, the high-rate lithium battery used in the model aircraft can be charged at a maximum current of 5C. As for the size of the charger, it depends on the current and voltage. For example, if you charge one of the above 26650 batteries, you can configure a charger with a power of 25W.
10、Safety of 26650 Lithium Batteries Using Different Materials
The 26650 lithium battery is mainly divided into two types: ternary lithium material and lithium iron phosphate material.
Ternary lithium material
Voltage: 26650 lithium battery nominal voltage 3.6V, fully charged voltage 4.2V, discharge cut-off voltage: 3.0V
Capacity: 26650 lithium battery capacity is generally 4500mAh, 5000mAh, 5500mAh, 6000mAh relatively more.
The ternary lithium material is flammable and catches fire very quickly when struck.
Lithium Iron Phosphate Materials
Voltage: 26650 lithium battery nominal voltage 3.2V, fully charged voltage 3.65V, discharge cut-off voltage: 2.0V
Capacity: 26650 lithium battery capacity includes 2800mAh, 3000mAh, 3200mAh, 3400mAh, 3600mAh, 3800mAh, 4000mAh and other capacity segments.
The burning speed of lithium iron phosphate materials is slow, and the safety is higher than that of ternary lithium materials.