2-4. Install the 3.2-inch LCD display. Fix it on the back with 708 silicone rubber (Figure 1)
III.Assemble the fuselage.
3-1. Install EVA sponge and epoxy board (Figure 3).
3-2. Install the battery. Pay attention to the placement of the battery (Figure 4).
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3-3. Install the metal baffle with the screw holes facing upward (Figure 5).
3-4. Install the connecting piece (with the cap), Figures 6 and 7.
3-5. Connect the ribbon cable. The black wire is connected to the total negative pole of the battery. The red wire is connected in turn as shown in (Figure 8). 3-6. Install a metal strip (1 piece) and tighten the screws (Figure 9). 
3-7. Install the protection board and tighten the screws (Figure 10).
3-8. Cover the box and tighten the screws on both sides (Figure 11).
3-9. Install the “B-” wire of the protection board and connect it to the total negative pole of the battery (Figure 12). 3-10. Install the “P-” wire of the protection board (Figure 13) to lead out the total negative pole. 
3-11. Connect the negative wire of the Anderson connector and the “P-” wire of the protection board to the negative terminal. Fix and tighten with screws (Figure 14).
3-12. Connect the positive wire (red) of the Anderson connector and the total positive wire (black) of the battery to the positive terminal. Tighten the screws (Figure 15).
3-13. Test the voltage (the negative wire of the voltmeter is connected to the negative pole of the ribbon cable, and the positive wire of the voltmeter is sequentially aligned with the positive pole of the ribbon cable for testing) - (Figure 16).
3-14. Insert the ribbon cable into the corresponding position “B+B8B7B6B5B4B3B2B1B-” of the protection board - (Figure 17).
3-15. Insert the LCD display cable into the corresponding position “display screen” of the protection board - (Figure 17).
3-16. Insert the temperature wire into the corresponding position “temperature” of the protection board - (Figure 17).
IV. Parameter Configuration and Debugging 1. Scan the "QR code" on the right with your mobile phone, download the "APP" for Jikong protection board and install it.
2. Press and hold the switch of the LCD display for 3 seconds to activate the protection board.
3. Turn on the Bluetooth of your mobile phone (Figure 18).
4. Open the installed "APP" for Jikong protection board and connect to "JK-B1A8S20P" (Figures 18 and 19).
5. Firstly, the default factory pairing password is 1234, and the default authorization password for modifying parameters is 123456.
6. Click "Parameter Setting" (Figure 20).
7. Click "Authorization Setting" (Figure 21).
8. Enter the password "123456" and click "Verify" (Figure 22).
9. Click "One-click Lithium Iron Phosphate", set the corresponding parameters (the number of single cells (in series) and battery capacity (Ah) as well as continuous charging current (50)), and click "Set". (Figures 23 and 24).
10. Click BMS control and turn on the charging switch, discharging switch, and equalization switch (Figure 25). 
V. Close the cover and install the left and right handles. 
After you assemble the 12V 280AH battery pack, the following precautions will ensure the safe, stable and long-lasting operation of your battery pack. I. Charging precautions 1. Use a matched charger: Be sure to choose a charger specially designed for 12V large-capacity batteries. Avoid using an inappropriate charger, which may lead to abnormal charging, overheating and even overcharging and damage to the battery.
2. Control the charging environment: When charging, the battery should be placed in a well-ventilated, dry and suitable temperature environment. Avoid charging near high temperatures, humidity or flammable materials to prevent danger.
3. Monitor the charging process: During charging, regularly check the temperature and voltage of the battery pack. If abnormal temperature rise or unstable voltage is found, stop charging immediately and check the reason.
II. Usage precautions
1. Avoid excessive discharge: Try to avoid completely discharging the battery pack to avoid irreversible damage to the battery. When the battery power is close to the low power warning, it should be charged in time.
2. Control the load: Ensure that the load connected to the battery pack is within its rated range to avoid overloading and causing overheating, shortened life or damage to the battery.
3. Prevent short circuits: During use, ensure that the wire connections are firm and avoid short circuits caused by looseness or poor contact. At the same time, prevent metal objects from accidentally contacting the positive and negative poles of the battery.
III. Storage precautions 1. Appropriate storage environment: If the battery pack is not used for a long time, it should be stored in a dry, ventilated and moderate temperature place. Avoid direct sunlight and humid environments.
2. Regular charging maintenance: During storage, the battery pack should be charged regularly to maintain the activity of the battery. Generally, it is recommended to charge once every few months.
3. Disconnect: When storing, the battery pack should be disconnected from external devices to prevent self-discharge or accidental discharge of the battery.
IV. Safety precautions 1. Take protective measures: When operating the battery pack, appropriate protective equipment such as gloves and goggles should be worn to prevent accidental injury.
2. Keep children away: Place the battery pack in a place where children cannot reach to avoid accidents.
3. Professional maintenance: If the battery pack malfunctions or is abnormal, do not disassemble or repair it by yourself. Seek the help of professionals.
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