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3.6V C ER26500 Li-SoCl2 Battery (8500/9000mAh)

Short Description:

With 20+ Years of Experience, Pkcell has become a leading Li-Socl2 Battery manufacturer, Specializing in the production of the ER26500 battery.

Dimension: 26.3*50.5 mm

Self-Discharge Rate (Year): <1%

Shelf Life: >10 Years

Opearting Temperature: -55~85 °C

Max Discharge Current: 200 mA (continuous), 400 mA (Pulse)

Applications : Electronic devices and Electric power/water/gas meters,Memory ICs and more.


Certified By IEC, SNI, BSCI, and More, Ensuring Top-Notch Quality and Safety.

PKcell Certification

Product Detail

Product Tags

  • * High and Stable Voltage
  • * Energy Density up to 590Wh/kg
  • * Long Shelf Life (less than 1% per year after 1  year of storage at +25℃)
  • * Wide Operating Temperature (-60℃~+85℃)

Specification of ER 26500


Open circuit voltage (at 25°C) ≥3.65V
Nominal capacity 8500mAh
(At +25°C, the battery is discharged at continuous current 3mA until the voltage reaches cut-off voltage 2.0V. The capacity can vary at a different temperature, discharge current or cut-off voltage.)
Maximum continuous current 150mA
(New cell, at +25°C, 2.0V cut-off, battery discharged for
minimum 50%°C of nominal capacity.)
Maximum pulse discharge current 250mA
(300 mA/0.1 second pulses, drained every 2 minutes at +25°C from undischarged the new cell with 10 uA base current, yield voltage reading above 3.0V. The readings may vary according to the pulse characteristics, the temperature, and the’s previous history. Fitting the cell with a capacitor may be recommended in severe conditions, consult PKCELL.)
Storage (recommended) ≤30°C, ≤75%RH
Operating temperature range -55°C to +85°C
Diameter 25.6±0.2mm
Height 49.1±0.5mm
Typical weight 55.0g
Li metal content 2.4g
Available Terminations 1) Standard terminations 2) Solder tabs 3) Axial Pins 4) or special requirement (wire, connectors, etc)


Alarms and security systems, GPS, metering systems, memory back up, tracking system and GSM communication, Aerospace, Defence, Military, Power Management, Portable Devices, Consumer Electronics, Real-time clock, Tracking system, Utility metering,etc.

Single battery with Cables and Connectors is Available. If the voltage or capacity of a single battery does not meet your requirements, we can supply battery pack solutions!



1)These are non rechargeable batteries.
2)Fire, explosion and burn hazard.
3)Do not recharge, short circuit,crush, disassemble, heat above 100℃ incinerate.
4)Do not use the battery beyond the permitted temperate range.

Typical Discharge Characteristics
What is a Spirally Wound Cell?

On the other hand, spirally wound construction involves rolling the electrodes, separator, and electrolyte into a tightly wound spiral configuration. The positive and negative electrodes are wound together with a separator in between, forming a spiral-shaped core. This core is then inserted into a cylindrical metal casing, providing structural support and serving as the outer shell of the battery. The larger surface area of the anode and cathode allows for high-rate discharges.

What is a Bobbin Cell?

Bobbin construction cells have a distinct feature where the anode and cathode have a relatively small shared surface area. In this type of cell, a single cylinder of cathode material is surrounded by the anode material. Due to the low common surface area, these cells have limited capability for high-rate discharges but an increased space to hold more anode material, allowing for more energy to be stored.

What is Passivation?

Passivation is a surface reaction that occurs spontaneously on the lithium metal surface in all primary Lithium batteries with liquid cathode material such as Li-SO2, Li-SOCl2 and Li-SO2Cl2. A film of lithium chloride (LiCl) quickly forms on the lithium metal anode surface, and this solid protecting film is called the passivation layer, that prevents direct contact between the anode (Li) and the cathode (SO2, SOCl2 and SO2Cl2). Put simply, it prevents the battery to be in permanent internal short circuit and discharging of its own accord. That’s why it enables liquid cathode-based cells to have a long shelf life.

How does Passivation effect self-discharge in Li-SoCl2?

This passivation layer acts as a barrier, reducing the loss of stored charge and minimizing self-discharge over time. As a result, Li-SoCl2 batteries can retain their charge for long periods, making them ideal for applications requiring low self-discharge rates, such as in remote sensors, backup power systems, and other devices that experience intermittent use.

What Factors Affect the Degree of Passivation?

The longer the time and the higher the temperature, the more serious the passivation of lithium thionyl chloride batteries.

What is Influence of Passivation on Battery Performance?

The passivation phenomenon is an inherent characteristic of lithium thionyl chloride batteries. Without passivation, lithium thionyl chloride batteries cannot be stored and lose their use value. Since the lithium chloride generated on the surface of metallic lithium in thionyl chloride is very dense, it prevents further reaction between lithium and thionyl chloride, making the self-discharge reaction inside the battery very small, which is reflected in the characteristics of the battery, that is, the storage life is more than 10 years. This is the good side of the passivation phenomenon. Therefore, the passivation phenomenon is to protect the battery capacity and will not cause the loss of battery capacity.
The adverse effects of the passivation phenomenon on electrical appliances are: After a period of storage, when it is first used, the initial operating voltage of the battery is low, and it takes a certain amount of time to reach the required value, and then to the normal value. This is what people often call "voltage lag". Voltage lag has little effect on uses that do not have strict time requirements, such as lighting; but for uses that have strict time requirements, if used improperly, it can be said to be a fatal flaw, such as weapon systems; it has little effect on uses where the current does not change much during use, such as memory support circuits; but for use conditions where the current occasionally changes, if used improperly, it can also be said to be a fatal flaw, such as the current smart gas meters and water meters.

What Should be Avoided When the Battery is Passivated?

1. Trying to reduce your consumption at all costs
2. Not taking into account the field temperature of your
3.Overlooking the application's minimal cut-off voltage
4. Choosing a battery that is bigger than necessary
5. Not considering the specific pulse requirements in the
discharge profile of your application
6. Taking the information indicated on the datasheet at face value
7. Believing that a test at ambient temperature is fully
representative of the overall field behavior of your application


Li-SOCl2(Energy Type) Specifications
Model  IEC Nominal Voltage(V) Dimensions       (mm) Nominal Capacity (mAh) Standard Current     (mA) Max Continuous Discharge Current         (mA) Max  Pulse Discharge Current (mA) Cut-off Voltage (V) Weight Approx (g) Operating      Temperature          (°C)
ER10450 AAA 3.6 10.0×45.0 800 1.00  10 20 2.00  9 -55~+85
ER14250 1/2AA 3.6 14.5×25.0 1200 0.50  50 100 2.00  10 -55~+85
ER14335 2/3AA 3.6 14.5×33.5 1650 0.70  50 100 2.00  13 -55~+85
ER14505 AA 3.6 14.5×50.5 2400 1.00  100 200 2.00  19 -55~+85
ER17335   3.6 17×33.5 2100 1.00  50 200 2.00  30 -55~+85
ER17505   3.6 17×50.5 3400 1.00  100 200 2.00  32 -55~+85
ER18505 A 3.6 18.5×50.5 4000 1.00  100 200 2.00  32 -55~+85
ER26500 C 3.6 26.2×50.5 8500 2.00  200 400 2.00  55 -55~+85
ER34615 D 3.6 34.2×61.5 19000 3.00  200 400 2.00  107 -55~+85
ER9V 9V 10.8 48.8×17.8×7.5 1200 1.00  50 100 2.00  16 -55~+85
ER261020   3.6 26.5×105 16000 3.00  200 400 2.00  100 -55~+85
ER341245   3.6 34×124.5 35000 5.00  400 500 2.00  195 -55~+85

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