Replace the battery.
Possible causes of zero or low voltage in the battery:
1, lithium battery suffered from external short circuit or overcharge, backcharge (forced overdischarge).
2. The battery is continuously overcharged by high rate and large current, resulting in the expansion of the battery core and direct contact of the positive and negative electrodes.
3, the battery internal short circuit or micro short circuit, such as the positive and negative electrode sheet has burr through the diaphragm paper contact short circuit, the positive and negative electrode sheet is improperly placed to cause the pole sheet contact short circuit, or the positive electrode sheet contact the steel shell short circuit, the positive ear contact the negative sheet short circuit, the negative powder into the diaphragm paper, the diaphragm paper itself has defects.
Extended information:
considerations
1. Read the battery manual carefully, use the recommended battery, and operate according to the operating procedures.
2. Check whether the contact parts of electrical appliances and batteries are clean, wipe them with a wet cloth if necessary, and load them in the correct polarity direction after drying.
3, adult supervision, do not let children replace the battery, small batteries such as AAA should be placed in a place where children can not get.
4, do not mix new, old batteries or different models of batteries, especially can not mix dry batteries and rechargeable batteries.
5, do not heat the battery or throw the battery into water or fire, putting the battery in water will make the battery fail, putting the battery in the fire will make the battery crack.
When the lithium battery voltage has been reduced to below 2V, the charger is unable to charge it, at this time it is necessary to raise the voltage of the battery to about 3V, for example, you can use the parallel method to find a battery with normal voltage (about 3.0-3.3V is the best) and the undervoltage battery positive link positive, negative link negative, wait 1 minute, Then put the battery into the charger to charge normally, if not once, you can try several times;
Activate the charger method, this method is more suitable for a single lithium battery with a voltage lower than 1V, put the undervoltage lithium battery into the charger, the charger will not recognize or report errors, we use a normal battery, positive link to the positive charger, negative link to the negative charger, forcing the charging mode of the charger, it should be noted here that, Try to choose a charger with a small current to activate the undervoltage lithium battery
Use a charger that is a little smaller than the original voltage to charge, when the battery is charged to 20%, the voltage will restore the value, and then change back to the original matching charger.
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2, single battery charging, each individual battery in the battery pack is charged, but pay attention to the voltage of the charger to be consistent with a single battery, this method of battery recovery can take a long time.
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3, special charging method, the use of a special charger with repair function, no matter how low the voltage caused by self-discharge, this charger can be charged, after the lithium battery is fully charged, all aspects of the battery performance has been restored.
If you have a DC regulated power supply, if the battery is up to 4.2V, please adjust the regulated power supply to 4.2V, and then reduce the output current to 0.5A, connect the positive terminal of the power supply to the positive terminal of the battery, and the negative terminal of the power supply to the negative terminal of the battery.