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1. Freezing method for repairing bulges in aviation model polymer lithium-ion batteries: Wrap your aviation model lithium-ion battery in a dry towel, then wrap it in newspaper on the outermost layer, and put it in the refrigerator for 12 hours. After that, take it out. The battery shape will be restored to some extent, and it can be used again.

Repair case of polymer lithium-ion battery bulge: By chance, one of my polymer aviation model polymer lithium-ion batteries used a bulge, which may have overcharged to 4.3V and was about to explode. It's better to put it in the refrigerator for an hour, and never put it in the freezer; Prepare another ice bag, put it in the freezer to freeze into ice, and the ice bag should not leak water; After removing the battery, the bulge had disappeared. Then place the battery on an ice pack, start discharging the battery, and set the voltage to 3.8V. Then, put a plastic bag around the battery, making sure to tie the mouth tightly and squeeze the air inside the bag. Then, press the battery under the ice pack and let it sit there. Wait for the ice pack to turn into water and return to room temperature. At this point, you will see that the bulge of the aviation model lithium-ion battery has disappeared. This indicates that using freezing to repair the bulge of the aviation model lithium-ion battery has been effective. If the battery is relatively large and thick, you can use crushed ice cubes and put them in a bag to prevent water leakage. Press the battery under the ice pack, and you can try it out. Anyway, all bulges are dead horses and live horses.

2. Repair method for bulge of aviation model polymer lithium-ion battery: It can be done by turning on and discharging or connecting a resistor. The turning on and discharging should be done to the extent that the phone stops when turned on; Resistance discharge can be achieved by connecting a small electric ball with the corresponding voltage for a long time until it extinguishes instantly when connected. The discharge current should be high, and if conditions permit, the pilot can fly a few rounds of discharge on the aircraft model shuttle, which is also a good method.

3. Activation repair method for polymer lithium-ion battery bulge repair: Connect the aircraft model battery in series with 12V AC power, and also connect a small electric bead or resistor between the batteries for current limiting; Firstly, activate with a small current to maintain the AC power of the control circuit at tens of milliamps for 30 to 60 minutes, then increase the current to 1-2 times the nominal value of the battery.

Case study of polymer lithium-ion battery drum repair: Before activating the repair, it is important to first understand your aircraft model shuttle, and also to understand the key points to pay attention to the parameters and performance of the drone aircraft model lithium-ion battery. Otherwise, the current used for activation may not be correct; The China Lithium ion Battery Forum found that if a 1000mAh battery is added to 1000mA~2000mA and activated for 30-60 minutes, attention should be paid to the temperature and appearance of the battery during the above process. There should be no abnormal phenomena such as overheating, smoking, or bulging. If the temperature is too high (above 40 ℃), the current should be appropriately reduced. Lithium ion batteries that have undergone the above activation treatment can generally be used normally, but cannot be compared with new batteries.

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