Rechargeable Lipo Lifepo4 Batteries 803040 3.7v 1000mAh 3.7wh Solar Lithium

1. Main Difference: Voltage Platform and Energy Density

Low-voltage version: Typically refers to ternary lithium batteries with a 3.6V/3.7V voltage platform. Its full-charge cutoff voltage is generally 4.2V, and its discharge cutoff voltage is approximately 2.75V-3.0V.

High-voltage version: Typically refers to ternary lithium batteries with a 3.8V/3.85V voltage platform. Its full-charge cutoff voltage is higher, generally 4.35V or 4.4V, and its discharge cutoff voltage is also approximately 2.75V-3.0V.

Key Impact: At the same capacity (1000mAh), the high-voltage version, due to its higher voltage platform, delivers more actual electrical energy (Wh) according to the formula "Energy = Voltage × Capacity," providing a longer single-charge usage time for devices.

2. Applicable Devices and Charging Requirements

Low-voltage version (4.2V cutoff): Suitable for devices with traditional designs whose charging management ICs (chips) only support a 4.2V full-charge cutoff voltage. Using a low-voltage battery in a high-voltage charging circuit may result in insufficient charging and incomplete capacity utilization.

High-voltage version (4.35V/4.4V cutoff): Requires the device's charging management IC to support a higher cutoff voltage. Using a high-voltage battery in a device that only supports 4.2V charging will prevent the battery from being fully charged, significantly reducing its usable capacity. Conversely, using a high-voltage charger to charge a low-voltage battery can lead to overcharging, posing a safety risk.

3. Materials and Cycle Life

Differences in voltage platforms stem from adjustments to the cathode material formulation, thus affecting cycle life.

Low-voltage version: The cathode material formulation is more mature, resulting in relatively better cycle stability. Under standard charge and discharge conditions, the cycle life typically reaches 500-800 cycles (capacity retention ≥80%).

High-voltage version: To improve the voltage platform, the cathode material undergoes special modifications, but the material structure is more prone to aging under high-voltage conditions. Therefore, its cycle life is usually slightly lower than that of the low-voltage version, generally between 400-600 cycles (capacity retention ≥80%).

Main Features:

Performance Characteristics

Stable Voltage and Capacity: With a nominal voltage of 3.7V, it provides a stable power output to devices, ensuring normal operation. The nominal capacity of 1000mAh meets the power needs of some small to medium power devices.

High Energy Density: Despite its small size, this battery provides 3.7Wh of energy, making it suitable for devices with limited space.

Good Charge/Discharge Performance: The standard charging current is typically 0.2C (200mA), and the fast charging current can reach 0.5C (500mA), allowing for a quick full charge.

The discharge cutoff voltage is 2.75V, allowing for normal discharge within a temperature range of -20℃ to 60℃.

Long Cycle Life: Under 0.2C charge/discharge conditions, after 500 cycles at room temperature, the battery capacity retains over 80%, demonstrating a long service life and reducing operating costs.

Low self-discharge rate: The self-discharge rate of lithium batteries differs between a fully charged state and a 70% charge state. The self-discharge rate is slightly higher at a full charge than at 70%, but the overall self-discharge rate is low, allowing for long-term storage.

Protection Functions:

Overcharge Protection: When the battery charging voltage reaches or exceeds the set overcharge detection voltage (e.g., 4.28V±50mV), the internal protection circuit automatically cuts off the charging circuit to prevent damage from overcharging and potential safety hazards.

Over-discharge Protection: When the battery discharge voltage is lower than the set over-discharge detection voltage (e.g., 2.4V±100mV), the protection circuit cuts off the discharge circuit to prevent over-discharge and extend battery life.

Overcurrent Protection: When the battery discharge current exceeds its rated maximum discharge current, the protection circuit quickly activates, cutting off the discharge circuit to prevent overheating and damage to the battery due to overcurrent.

Short Circuit Protection: If an accidental short circuit occurs between the positive and negative terminals of the battery, the protection circuit will respond immediately, cutting off the circuit to avoid battery damage and safety hazards caused by the short circuit.

Over-temperature protection: When the internal temperature of the battery becomes too high due to various reasons (such as high current charging and discharging, or excessively high ambient temperature), the protection circuit will activate the over-temperature protection function to stop the charging and discharging operation of the battery and ensure battery safety.