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There are a few ways to reactivate a dead 26650 lithium battery. First, make a USB cable with a smaller end to connect the battery to a computer. You can make your own or purchase a cable at an IT store. The male USB end should plug into your computer. The voltage coming out of the USB port should be 5V. Plug in the dead battery and wait a minute. Afterward, check the terminal voltage of the dead battery with a multimeter.

You can also try pulling the positive terminal cover of the battery and push it into the negative terminal. This will release a gas that will help you to revive the battery. This will make it possible to use the battery further. Be aware that this method can damage the CID. It is also dangerous to reactivate a lithium ion cell, as it can explode without warning.

In addition, the dead battery must be monitored to prevent further damage. If it is hot, it is not good. It is likely to be too discharged and degraded. This can cause the battery to explode. In this case, you should immediately dispose of the battery and contact your retailer. Always remember to recycle any battery with this danger level. While this method may work, you should always do it under supervision.

Besides the manual, you can also try to recharge the battery by following a certain process. It might take a few minutes, but it is still worth a try. If you follow the instructions in your charger’s manual, you should be able to recharge the battery. This method does not work for every case, but it will usually work for the majority of cases. However, it is worth a try.

To check whether the 18650 battery is damaged, the method is as follows:

1. The label of the checked 18650 lithium-ion battery confirms that its voltage output is 3.7V, but the capacity may be larger or smaller than 2000mAh (some are 3000mAh)
2. Find the positive and negative poles of the 18650 lithium-ion battery. The round protrusion of the battery is the positive pole of the battery, and the flat bottom is the negative pole.
3. Use a multimeter to check the output voltage. Make sure it’s set to measure voltage. Place the small metal rod at the end of the red cable onto the positive terminal of the 18650 Li-Ion battery. Place the metal rod at the black end of the multimeter on the negative end of the battery.
4. Check the multimeter display panel. If the battery is in normal condition, it should show between 3.6 and 3.7V. If the reading is below 3.5V, fully charge the battery. If it’s still below 3.5V after charging, it means you need to replace it, as these are all signs that the battery charge is slowly depleting.
5. Check the battery capacity, set the multimeter to measure the amount of current passing through each hour, and place two metal rods on the positive and negative metal ends of the battery.
6. Check the multimeter display. A fully charged Li-Ion 18650 battery whose mAh matches the label indicates that the battery is in good use.