NO.	Items	Specifications
1	batteries	3.7V 4000mah lipo battery
2	Charge voltage	4.2V
3	Nominal voltage	3.7V
4	Nominal capacity	4000mAh 0.2C Discharge
5	Charge current	Standard Charging:0.2C Rapid charge: 1.0C
6	Standard Charging method	0.5C CC(constant current)charge to 4.2V, then CV(constant voltage 4.2V)charge till charge current decline to ≤0.05C
7	Charging time	Standard Charging:2.75hours(Ref.) Rapid charge: 2hours(Ref.)
8	Max.charge current	0.5C
9	Max.discharge current	1.0C
10	Discharge cut-off voltage	2.5V0.25V(0.2C)
11	Operating temperature	Charging: 0 °C ~45 °C Discharging:0 °C ~45 °C
12	Storage temperature	-10°C~ +45 °C
13	Dimension	Length:85±0.5mm (not including tabs) Width:50±0.5mm Thickness:8±0.2mm
14	Drop Test	The cell is to be dropped from a height of meter twice onto concrete ground. No fire, no leakage
15	cycle time	≥800times

Cathode Material:

Lithium Cobalt Oxide (LiCoO₂)
- High Energy Density: It is one of the most commonly used cathode materials. LiCoO₂ provides a relatively high energy density, which allows lithium - polymer batteries to store a significant amount of energy. This makes it suitable for applications where space and weight are critical factors, such as in portable electronics like smartphones and laptops. The energy density can reach up to around 150 - 200 Wh/kg.
- Good Electrical Conductivity: It has good electrical conductivity, which enables efficient transfer of lithium ions during the charge - discharge process. This helps to ensure a relatively high - power output and fast charging capabilities. However, it also has some drawbacks.
- Safety and Cost Concerns: LiCoO₂ - based batteries can be more prone to safety issues such as overheating and thermal runaway, especially if not properly managed. Additionally, cobalt is a relatively expensive and scarce material, which can increase the cost of the battery and may also have environmental and ethical implications related to its mining and supply chain.
Lithium Manganese Oxide (LiMn₂O₄)
- Enhanced Safety: LiMn₂O₄ is known for its better safety characteristics compared to LiCoO₂. It is less likely to experience thermal runaway and is more thermally stable. This makes it a preferred choice in applications where safety is of high importance, such as in some electric vehicles and power tools.
- Lower Cost: Manganese is more abundant and less expensive than cobalt, so using LiMn₂O₄ can help to reduce the cost of the battery. However, its energy density is somewhat lower than that of LiCoO₂, usually around 100 - 130 Wh/kg.
- High - Power Applications: It is well - suited for high - power applications that require rapid charge - discharge cycles. The structure of LiMn₂O₄ allows for relatively fast lithium - ion diffusion, enabling the battery to deliver high - power output quickly. For example, it can be used in applications like electric scooters and some high - performance RC (Remote - Controlled) devices.
Lithium Iron Phosphate (LiFePO₄)
- Excellent Thermal Stability: LiFePO₄ is renowned for its outstanding thermal stability. It has a very stable crystal structure, and even under extreme conditions such as overcharging or short - circuits, it is less likely to release oxygen or undergo violent chemical reactions. This makes it one of the safest cathode materials available.
- Long Cycle Life: It can endure a large number of charge - discharge cycles. Typically, a LiFePO₄ - based lithium - polymer battery can have a cycle life of 2000 - 3000 cycles or more with a relatively small capacity loss. This makes it ideal for applications where long - term reliability and durability are crucial, such as in energy storage systems and some electric vehicles.
- Moderate Energy Density: The energy density of LiFePO₄ is around 90 - 140 Wh/kg, which is lower than that of LiCoO₂ but still sufficient for many applications. Its relatively stable voltage output during the charge - discharge cycle also provides consistent power supply, which is beneficial for electronic devices that require a stable power source.

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