Battery consumption means that the battery voltage cannot rise, and the capacity is low. Directly measure it with a voltmeter. If the voltage across the 18650 battery is lower than 2.7V or not. It means that the battery or battery pack is damaged. The deformed voltage is 3.0V~4.2V (some 3.0V batteries will have a voltage cutoff, the 4.2V battery voltage will be full and full, and some varieties will also have 4.35V) 3. If the battery voltage is less than 2.7V, you may use a charger (4.2V) to charge the battery. After ten minutes, if the battery voltage rises, it may be continuously charged until the charger prompts to charge, and then look at the charge voltage. If the full voltage is 4.2V, it means that the battery is deformed, and it should be that the last time the power is consumed too much and the battery is off. If the full voltage is much lower than 4.2V, it means that the battery is damaged. If you use a battery for a long time, you may be judged that the battery life has reached and the capacity is basically exhausted. Should be replaced. It is basically impossible to fix. After all, lithium batteries have a lifespan, not endless. 4. If the battery is measured, the battery is not voltage, there are two situations at this time. One is that the battery is originally good, and the long-term power loss is caused by the storage, which has a certain rate of recovery. Some of them use a lithium battery pulse activator to charge the battery repeatedly in a short period of time. Possible repair. Some repair costs are not low, so you should buy a new one. Another possibility is battery consumption, battery barrier breakdown, and positive and negative short circuits. This kind of thing cannot be fixed. Only new ones can be purchased.
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