POWERWIN BT10 12.8V 10Ah LiFePO4 Battery User Manual

1. Introduction

Thank you for choosing the POWERWIN BT10 12.8V 10Ah LiFePO4 Battery. This manual provides essential information for the safe and efficient use, installation, and maintenance of your battery. Please read it thoroughly before operation.

What's in the Box:

• POWERWIN BT10 Battery
• User Manual

For a visual overview of the product and its applications, please watch the official product video:

2. Safety Precautions

Please read and adhere to the following safety guidelines before using the battery:

1. When using the battery for the first time, fully charge it before use.
2. Do not expose the battery to water or rain.
3. Do not charge the battery in the presence of fire or extreme heat.
4. Avoid using or storing the battery near heat sources such as a fire or heater. If the battery leaks or emits an odor, remove it from the vicinity of an open flame immediately.
5. Ensure that the positive and negative terminals are not reversed.
6. Avoid placing the battery in fire or subjecting it to heat.
7. Do not short-circuit the positive and negative electrodes of the battery using wires or other metal objects.
8. Do not puncture the battery housing with nails or other sharp objects, and avoid hammering or pedaling on the battery pack.
9. Disassembly of the battery and its components is strictly prohibited.
10. If you notice any unusual signs such as an odor, heat, deformation, discoloration, or any other abnormal behavior from the battery, stop using and disconnect immediately.
11. Avoid using the battery in a high-temperature environment, as it may overheat and affect its performance and shorten its service life.
12. If battery electrolyte contacts your eyes due to a leak, do not rub your eyes. Rinse your eyes with water right away and seek medical help. Immediate action is essential to prevent potential eye damage.

3. Technical Specifications

POWERWIN BT10 battery highlighting its capacity, nominal voltage, and current capacity.

Detailed information on BT10 dimensions, voltage, current, weight, and recommended temperatures.

Battery Comparison (LiFePO4 vs. Lead-Acid)

Comparison table between Lead-Acid and POWERWIN LiFePO4 batteries highlighting advantages of LiFePO4 in weight, size, lifespan, cycle times, and Depth of Discharge (DoD).

The POWERWIN LiFePO4 battery offers significant advantages over traditional Lead-Acid batteries:

• Weight: 2.2 lbs (LiFePO4) vs. 8 lbs (Lead-Acid)
• Size: 6"x2.6"x3.7" (LiFePO4) vs. 7"x3"x3.5" (Lead-Acid)
• Lifespan: 10 Years (LiFePO4) vs. 3 Years (Lead-Acid)
• Cycle Times: 4000-15000 (LiFePO4) vs. 200-500 (Lead-Acid)
• DoD (Depth of Discharge): 100% (LiFePO4) vs. 80% (Lead-Acid)

4. Charging Methods

A. Battery Characteristics & Charging Mode

The voltage measured during charging or discharging LiFePO4 batteries may not accurately represent their actual voltage. After charging or discharging and disconnecting the battery, the voltage may gradually settle to its true voltage over time.

Note:

To accurately test the battery's real voltage, disconnect all connections and measure it after resting for over 30 minutes. The expected true voltage should be around 13.4V.

Charging Phases:

• Phase I: CC (Constant Current)
  Initially, a discharged battery will be charged at a constant current, and the voltage will rise steadily until it reaches a constant voltage point, which varies with different charging methods.
• Phase II: CV (Constant Voltage)
  In this phase, the battery maintains a constant voltage while the current rating drops to 2A (0.02C), which is also known as constant current mode.

Diagram illustrating the two phases of thermal control: Detect (BMS detects resistance affected by temps) and Manage (Auto cut-off when value too high/low).

B. Charging Mode Options

Two recommended charging methods: Solar + Solar Regulator and P20 Smart Charger.

Method 1: Battery Charger

Use a dedicated 14.6V LiFePO4 battery charger to maximize the battery's capacity.

• Recommended charging voltage: 14.2V to 14.6V
• Recommended charging current:
  The 2A (0.2C) battery will be fully charged to 100% capacity in about 5 hours.
  The 5A (0.5C) battery will be charged in about 2 hours at 97% state of Charge.

Note:

1. Connect the charger to the battery before plugging it into the power outlet to prevent sparks and potential fire hazards.
2. Disconnect the charger from the battery once it is fully charged.
3. Avoid reversing the positive and negative terminals during connections.

Method 2: Solar Panel and Controller

• Recommended Solar Panel Power: 30W (A 30W solar panel can fully charge the battery in one day with effective power of 4 hours/day).

It might take more than a day to fully charge, because the duration and intensity of light are important factors of charging efficiency.

Solar Charge Controller Settings:

• Recommended charging mode: 12V (14.6V)
• Recommended charging current:
  The 2A (0.2C) battery will be fully charged to 100% capacity in about 5 hours.
  The 5A (0.5C) battery will be charged in about 2 hours at 97% state of Charge.

Notes for Manual Controller Configuration:

If you need to manually configure the controller, please use the following parameters. It's important to note that these settings are specifically designed for LiFePO4 batteries, as different battery models have different charging requirements.

Method 3: Alternator / Inverter

The battery can be charged via an alternator or an inverter.

• A. DC Output: If your alternator or inverter provides DC output, consider incorporating a DC-DC charger between the battery and the generator.
• B. AC Output: If your alternator or inverter supports AC output, follow the charger's recommendations to add an appropriate battery charger between the battery and the generator.

• Recommended charging voltage: 14.2V to 14.6V
• Recommended charging current:
  The 2A (0.2C) battery will be fully charged to 100% capacity in about 5 hours.
  The 5A (0.5C) battery will be charged in about 2 hours at 97% state of Charge.

5. Connection Instructions (Series & Parallel)

A. Definition

The battery is connected to the battery with a total input and output cable, and two copper bars are added to multiple connecting cables.

B. Connection Steps

General steps for connecting multiple batteries.

1. Step 1: Connect Batteries
   Connect batteries to batteries by referring to the wiring diagram.
2. Step 2: Connect Positive Output Cables
   Connect the positive output cables of all batteries to a copper bar. If you are connecting batteries in series (where the positive terminal of one battery connects to the negative terminal of another), do not connect the positive electrode to the copper bar to ensure a proper series connection for the battery system.
3. Step 3: Connect Load
   Connect the load to the copper bar. The cable table used in this step should be able to support the total input and output current of the entire battery system.

C. Connect in Series

Instructions for serial and parallel battery connections.

Note:

When you connect batteries in series, the voltage increases while the amperage (ampere) remains the same. For example, if you connect two 12.8V 10Ah batteries in series, the battery system's voltage will be 25.6V, and the capacity remains at 10Ah.

D. Connect in Parallel

Note:

When you connect batteries in parallel, the ampere increases while the voltage remains the same. For example, if you connect two 12.8V 10Ah batteries in parallel, the battery system's voltage remains at 12.8V, and the capacity will be 20Ah.

E. Restrictions

Up to 16 identical batteries can be connected: 4 in series for 48V (51.2V) & 4 parallel for 40Ah battery systems in total.

Visual representation of supporting up to 4-series and 4-parallel connections for greater voltage and capacity.

F. Other Connection Modes

6. Before Connection / Equalization

A. Safety Precautions for Battery Connection:

1. Always wear insulating gloves before making any connections.
2. Avoid reversing the battery's polarity or creating short circuits when connecting the positive and negative terminals.

B. Balancing Voltage in Parallel Battery Connections:

1. When connecting batteries in parallel, ensure the voltages are equal.
2. For systems with multiple batteries, consider performing voltage equalization every 6 months to address potential voltage differences that may occur after five months of use. This helps maintain consistent voltage levels between battery packs and ensures optimal performance in series and parallel setups.

C. Equalization Steps

1. Charge each battery individually to its full capacity.
2. Connect the batteries one at a time in parallel and allow them to sit together for 12-24 hours, but no more than 4 groups.
3. The battery pack can be connected in both series and parallel configurations.

Restrictions for Series and/or Parallel Modes:

When using batteries in series and/or parallel modes, please ensure that the following conditions are met:

• Use batteries with the same battery capacity (Ah) and BMS (A).
• Choose batteries from the same brand (different brands of lithium batteries may have unique BMS requirements).
• Purchase batteries from nearby sources (within 1 month).

7. Extended Storage

1. When storing the battery pack for an extended period, ensure that the storage temperature remains within the range specified in the product specifications.
2. Long-term storage, defined as exceeding three months, should be conducted at a temperature of 25±5°C and a relative humidity of 65±20%RH.
3. Prior to storage, it's advisable to charge the battery pack to approximately 50-70% of its capacity.
4. Store the battery pack in a dry, well-ventilated location.
5. If the battery is stored for more than six months, it should be periodically maintained by cycling through charging and discharging.
6. Avoid exposure to corrosive substances, open flames, and heat sources.

8. Maintenance

1. When maintaining the battery pack, ensure that the battery's power level is between 40% and 70%.
2. Recommended maintenance for batteries not in regular use involves recharging every six months using the charger for 1 to 2 hours.
3. During maintenance, refrain from attempting to replace or remove individual batteries from the battery pack, as this may negatively impact battery performance.
4. Unauthorized disassembly or dissection of the battery core is strongly discouraged and should not be attempted.

9. Troubleshooting

If you encounter issues with your POWERWIN BT10 battery, refer to the table below. If the problem persists due to the BMS protection system being triggered, try the reactivation methods provided.

BMS Protection Reactivation

If the problem still exists because the BMS protection system has been triggered, you can try the following steps to reactivate it:

Method 1

1. Disconnect the battery from any devices.
2. Wait for 30 minutes, and the battery should return to normal voltage (above 10 volts).

Method 2

If the battery doesn't recover with Method 1, you can:

1. Use a charger with a "0V" function and charge the battery as usual.
2. Or charge the battery using an 18V-36V solar panel.

10. Transportation Precautions

1. During transportation, the battery pack must be adequately packaged to prevent severe vibration, impacts, and compression.
2. Protect the battery pack from exposure to direct sunlight and rain.
3. Transportation can be conducted using various means, including cars, trains, ships, planes, and other appropriate methods.

11. User Tips

Based on common inquiries and user feedback, here are some tips for optimal use:

• Battery Cell Type: The POWERWIN BT10 uses 3.2V/10Ah LiFePO4 cells, configured as 4S1P (4 cells in series, 1 parallel string) for a total of 12.8V and 10Ah. These are larger than typical 18650 cells, designed for higher capacity and performance.
• Initial Charge: Always fully charge the battery upon receipt before its first discharge cycle to ensure maximum capacity and longevity.
• Voltage Equalization: For multi-battery systems, performing voltage equalization every 6 months is crucial to maintain consistent performance and prevent imbalances.

12. Warranty & Support

Warranty

Our company provides customers with a warranty of 12 months from the date of purchase.

Customer Service

For any inquiries or support, please contact us at: service@iittechnology.com

You can also refer to the official user manual PDF for more detailed information: Download User Manual (PDF)