How to charge a 2S li-polymer battery

Introduction

Thank you for choosing our li polymer (LiPo) battery. This instruction manual provides essential information on properly charging your 2S li polymer battery. Please read the entire manual before charging your battery to ensure safety and optimal performance.

Safety Precautions

• Always charge the li polymer battery in a well-ventilated area, away from flammable materials and direct sunlight.
• Never leave the battery unattended during the charging process.
• Do not overcharge or over-discharge the battery.
• Inspect the battery for any damage or swelling before charging. If any signs of wear are present, do not charge the battery.
• For the safety and long-lasting performance of your li polymer battery, it is recommended to use a charger specifically designed for li polymer batteries with a balance charging function.

Charging Parameters

• Battery type: Li Polymer (LiPo)
• Cell count: 2 cells (2S)
• Voltage per cell: 3.7V (nominal), 4.2V (fully charged)
• Total voltage: 7.4V (nominal), 8.4V (fully charged)
• Charging current: For standard charging, use a current equal to 1C (where C is the battery capacity in amp-hours); for fast charging, use a current between 2C and 3C. (Note: Fast charging may reduce the battery’s overall lifespan.)
• Charging mode: Constant Current / Constant Voltage (CC/CV)
• Balance charging: Required for maintaining equal voltage levels across all cells.

Charging Process:

Step 1: Connect your 2S li polymer battery to the balance charger using the primary and balance connectors.

Step 2: Set your charger to the appropriate li polymer battery charging mode, and input the correct charging parameters outlined in section 2.

Step 3: Begin the charging process. The charger will apply constant current (CC) until the battery reaches 8.4V. It will then switch to constant voltage (CV) mode and maintain the voltage at 8.4V until the charging current drops below a predetermined threshold (usually around 1/10th of the initial charging current).

Step 4: The charger will indicate that the li polymer battery is fully charged once the charging process is complete. Safely disconnect the battery from the charger.

Effects of Fast Charging and Standard Charging:

• Fast Charging: A higher charging current (2C-3C) can decrease the overall charging time. However, fast charging may generate more heat, increase the risk of damage, and reduce the battery’s overall lifespan.
• Standard Charging: Using a lower charging current (1C) may take longer to charge the li polymer battery, but it is generally safer and can prolong its lifespan.

Conclusion

By following these instructions and charging parameters, you can ensure the safe and efficient charging of your 2S li polymer battery. Continually monitor the charging process and follow the safety precautions outlined in this manual.