Some people bought an electric car for a long time and didn't use it for a long time. After riding it a few months later, they found that the electric car was dead and could not be charged. Plug in the charging head, the signal indicator is always green, this is because the voltage of the lithium battery is too low, and there is too much difference between the output voltage of the charging head.

　　In this type of situation, it is generally said that the rechargeable battery is "starved to death". Such rechargeable batteries are generally replaced by new rechargeable batteries when they are sent to the after-sales maintenance service management center. There are several ways to save the use of this battery.

　　1. Tandem method.

　　12V rechargeable batteries with all normal working standard voltages are connected to all rechargeable batteries. For example, the original is a 48v20ah rechargeable battery, and then it is connected to a 12v20ah rechargeable battery. The high-power 12V rechargeable battery can continuously increase the working standard voltage of all rechargeable batteries, and then use the initial charging plug to recharge the battery, insert the charging plug, the charging plug signal light, and then charge the battery. When the charging plug is converted into a signal indicator, the rechargeable battery will be removed from the rechargeable battery. All general rechargeable batteries.

　　2. Parallel method.

　　For example, the original 48v20ah rechargeable battery, in addition to a series of 48v20ah rechargeable batteries, the high working standard voltage terminal will be introduced to the low working standard voltage terminal. This type of method is also used by many rechargeable car lithium-ion battery agents to check that there is no rechargeable battery, and it can also be used as an arrival station for battery charging.

　　3. Low voltage charging method.

　　Battery charging is carried out with a small and medium charging plug. For example, a 60v20ah rechargeable battery, if a 48v20ah rechargeable plug battery is used for charging. It is generally covered.

　　The above types of methods all require professional staff to operate the whole process, because the high specificity of lithium batteries, to avoid non-standard operation process, resulting in risks, due to low loss.

　　The 12v lithium battery is obtained by connecting several lithium batteries in series to get close to the 12v working voltage, and everyone who connects the lithium battery must be applied to the 12v lithium battery protection board, which can maintain the serial lithium battery pack. When the lithium battery is full, it can have the function of equalizing the working voltage difference of each single lithium battery, and reasonably handle the system loopholes of the series circuit.