What is a Battery?

A battery is a rechargeable lithium-ion cell with a cylindrical shape and standardized dimensions of 21mm in diameter and 70mm in length. It was developed as an improvement over the battery, offering higher capacity, better energy density, and improved efficiency, making it ideal for high-power applications such as electric vehicles and energy storage systems.

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Technical Specifications

• Chemistry: Like batteries, batteries come in various lithium-ion chemistries, including:
  • Lithium cobalt oxide (LiCoO₂ - LCO): High energy density but lower discharge rates.
  • Lithium manganese oxide (LiMn₂O₄ - LMO): Improved safety and thermal stability.
  • Lithium nickel manganese cobalt oxide (LiNiMnCoO₂ - NMC): Balanced energy density, power output, and safety.
  • Lithium iron phosphate (LiFePO₄ - LFP): Excellent safety and long cycle life but lower energy density.
• Voltage: Typically 3.6V or 3.7V nominal, with a full charge voltage of 4.2V and a discharged state at 2.5V to 3.0V.
• Capacity: Ranges from mAh to over mAh, depending on the chemistry and manufacturer.
• Discharge rate (C-rating): Some cells are designed for high-drain applications, offering continuous discharge rates (CDR) up to 45A or more.
• Cycle life: Can last between 500 to + charge cycles, depending on usage and chemistry.

Protected vs. Unprotected Cells

• Protected batteries: Feature an internal protection circuit to prevent overcharging, over-discharging, and short circuits, making them slightly longer than 70mm.
• Unprotected batteries: Lack built-in safety features and are generally used in battery packs with external battery management systems (BMS).

Common Applications

batteries are widely used in:

• Electric vehicles, with companies like Tesla and other manufacturers using them in battery packs for improved energy storage and performance.
• High-power consumer electronics such as flashlights, vaping devices, and power banks.
• Power tools, including drills, saws, and industrial-grade equipment.
• Renewable energy storage, such as solar power storage systems and backup power supplies (UPS).

Physical Variations

Some batteries come with slight design variations affecting their compatibility:

• Button top vs. flat top: Button top batteries have an extended positive terminal, while flat tops are flush.
• Protected vs. unprotected: Protected cells are slightly longer due to the built-in safety circuit.

As with any lithium-ion battery, it is essential to check the device manufacturer's specifications before using a battery to ensure compatibility and optimal performance.

Description

Samsung 40T mAh 35A Battery.

Samsung 40T

Introduction about this Samsung 40T battery:

The Samsung 40T battery is a high-performance power source with more capable and delivering a capacity of mAh with a discharge rate of up to 35 amps .Its long life cycle and Samsung’s reputation for quality and safety make it a reliable choice for powering a variety of devices, such as laptops and electric vehicles .Basically from now onwards you can enjoy the extended run times and consistent performance with more over than heavy use.

 Standard Charge Capacity:

Link to SINC(es,it,hi)

Accordingly Charge capacity means charging each cell with charge current of mA with the constant voltage of  4.2V.

  Discharge Capacity:

In discharge capacity each cell is measured with the discharge current of 800mA with discharge voltage of 2.65V.

Temperature Protection:

• As i have noted that the high temperature of  the battery ranges from 70℃ in discharging protection.
• Meanwhile in low temperatures the cell ranges up to -20℃

Appearance:

Especially they would be no such defects such as scratch, rust, discoloration and leakage which may adversely affect commercial value of the cell.

 Applications:  

Toys, Power Tools, Home Appliances, Consumer Electronics, BOATS, Golf Carts, electric vehicles including Electric Bicycles/Scooters, Electric Wheelchairs and finally Solar Energy Storage Systems

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Conclusion:

• Most important that it is not a waterproof cell.
• These cells are also available in all kinds of lithium-ion cells including ,, cylindrical cells.
• Store the battery at low temperature (below 20°C is recommended) due to low humidity, no dust and no corrosive gas atmosphere.

Manufacturer Samsung SDI Model 40T (3) Size Positive Terminal Flat Top Nominal Capacity mAh Continuous Discharge Rating (max) 35A Nominal Voltage 3.6V Maximum Voltage 4.2V Discharge cut-off Voltage 2.5V Protected No Rechargeable Yes Approx. Dimensions 21.1mm x 70.4mm Approx. Weight 68.7g Specification data sheet Samsung 40T Data Sheet