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Check to see if there is any disconnection or poor contact at the line output, or if there is a loose connection between individual units causing an open circuit. If this is the case, it can be easily resolved.

1. You can use a multimeter to measure the overall output voltage and see if it is normal. If the voltage is abnormal and the connection between the cells is normal, all the voltages of the cells can be measured separately to see if the sum of the series voltages is much higher than the output voltage. If so, it is estimated that the protection board is damaged and needs to be replaced. If it is obvious that the switch tube is burnt, you can try replacing it with the same model.

2. If a certain battery is broken and a so-called single lagging problem occurs, the car can be kicked up and the rear wheels can be turned to the fastest speed with a rotating handle in a suspended state. The voltage of each individual cell is measured separately. If the voltage is very low, it is a problem. You can find a separate charger to charge it and see if it can be charged. If it is, try reinstalling it. If it really doesn't work, then replace the individual units. Of course, these require some hands-on skills.

3. Check the area where the protective plate is located to see if there is anything squeezing it. For example, if the protective plate and metal plate are together, the protruding component feet on the back may puncture the outer heat shrink film, causing a short circuit or leakage when they come into contact with the metal, which can also lead to insufficient capacity of a certain series of batteries.

4. If you are more daring, you can try welding a bypass, which means you don't need to protect the board. When the battery is not working, you can short-circuit and use the protection board directly. However, it can be a bit dangerous, so most people should not play like this.

5. Any product has a lifespan issue. Although lithium batteries have more cycles than lead-acid batteries, they are also relatively delicate. If they are not properly protected in daily life, they will also age quickly. If it has been used for more than 3 years, the maximum limit will also be reached, and it is time to replace it with a new one.

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