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1. Undervoltage lithium-ion batteries may be rejected by chargers, and the vast majority of lithium-ion battery chargers will refuse to charge lithium-ion batteries that are already severely under voltage. It is important to prevent the wrong type of battery from being overcharged, and we must confirm the type of battery before repairing undervoltage lithium-ion batteries. Choose appropriate charging parameters to repair lithium-ion batteries;

2. When the voltage of a lithium-ion battery drops below 2V, the charger cannot charge it. At this time, the voltage of the battery needs to be raised to around 3V through assistance. For example, parallel connection can be used to find a battery with normal voltage (about 3.0-3.3V is the best) and connect the positive pole of the undervoltage battery to the positive pole, and the negative pole to the negative pole. Wait for 1 minute, then put the battery into the charger and charge it normally. If it doesn't work once, you can try several times;

3. Activate charger method, which is more suitable for single-cell lithium-ion batteries with a voltage below 1V. Place the undervoltage lithium-ion battery into the charger, and the charger will not recognize or report errors. We use a normal battery, with the positive pole connected to the charger's positive pole and the negative pole connected to the charger's negative pole, to forcibly trigger the charging mode of the charger. It should be noted that it is advisable to choose a charger with a smaller current to activate the undervoltage lithium-ion battery

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