Why can’t the 18650 battery 3.7v 3500mah start up? How to manage it?

　　If the 18650 battery 3.7v 3500mah is not used for a long time, the voltage will be too low and cannot be used; or the internal power device may be damaged; in addition, the first charge of the 18650 battery 3.7v 3500mah must be maintained for more than 12 hours. Next, I will introduce the details to you.

　　1. Reasons why the 18650 battery 3.7v 3500mah cannot be started

　　1. If the battery is left unused for a long time, the voltage will be low.

　　2. The input AC and DC power cords are not connected properly.

　　3. The internal power-on circuit of the UPS is faulty.

　　4. The UPS internal power circuit is faulty or the power supply is short-circuited.

　　5. The internal power components of the UPS are damaged.

　　2. 18650 battery 3.7v 3500mah management

　　1. Charging for the first time. For brand-new batteries, everyone generally thinks that the overall performance is relatively good, so during the management process, they often feel that they do not pay attention to it. For the battery pack of UPS power supply, the initial charging needs to ensure that the charging time is more than 12 hours. If it is not used frequently, it must be charged before placing it. Otherwise, it will affect the function of the battery and affect the UPS. The power supply causes some damage.

　　2. Avoid excessive discharge. The life of the battery also has a certain relationship with the number of discharges, because during the use of the UPS, many staff have a certain degree of over-discharge due to lack of experience. During the discharge process of the UPS, it will also have a certain impact on the battery itself. Therefore, it is necessary to minimize the number of deep discharges. In addition, when the UPS power supply is supplying power to the battery pack, there will often be an alarm, and the alarm time will last for 4-5 seconds. Based on the time and sound of this alarm, you can judge whether the power supply is normal or not, and thus whether the battery pack is in a deep discharge stage.

　　3. Maintain indoor temperature. The function of the battery is often closely related to the environment in which it is located, so the environment of the computer room will have a very direct effect on the performance of the UPS power supply. It can be seen from the corresponding requirements and regulations that the optimal temperature of UPS power supply is 25°C, the highest temperature should not exceed 40°C, and the lowest temperature should not be lower than 0°C. Generally speaking, the output capacity of the battery will often decrease due to the influence of temperature. In addition, when the temperature is too high, it will also have a certain impact on the inverter and stop running, thus causing a series of problems to the remote computer room equipment. negative effect.

　　4. Choose the appropriate charging method. At this stage, when charging UPS power supply, the constant voltage cutoff charging circuit is used by most charging systems, because the UPS itself is still a relatively sensitive system and has certain requirements for the charging voltage and current. When the charging voltage is too high or too low, it will have a certain impact on the battery pack. If the charging and discharging current value is too large, it will easily lead to deformation of the battery plates and a decrease in battery performance. Therefore, when performing actual charging, a suitable charger must be used, preferably with constant current and constant voltage functions, thereby maximizing the service life of the UPS power supply and further ensuring people's life safety. Reduce security threats.

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