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Generally, the charger for charging lead-acid batteries in electric vehicles adopts a three-stage charging mode. When 100% of the battery is used up, the charging time will be 8-10 hours, not more than 12 hours, which will affect the battery life. It is best not to use up all the electricity every time. It is recommended to charge the electric vehicle after using up about 70% of the electricity, and the charging time is generally around 6-8 hours.

Maintenance methods for lead-acid batteries

1. Do not replace the charger casually, and do not remove the speed limit of the controller

If the mileage requirement for cycling is relatively long, multiple chargers can be used. The charger that was recharged during the day can be replaced with another charger, while the original charger can be used at night. Removing the speed limit from the controller can increase the speed of some cars, but it can also reduce the safety of the car and shorten the battery life.

2. Protect the charger properly

Nowadays, most chargers are not designed with high vibration resistance. After vibration, the internal potentiometer of many chargers will drift, causing the entire parameter to drift and resulting in abnormal charging status. It should also be noted that the charging time should keep the charger ventilated, otherwise it will affect the lifespan of the charger and may also affect the charging status. This will cause damage to the battery, so protecting the charger is very important.

3. Charging every day

Charging every day will put the battery in a cyclic state and prolong its lifespan. The memory benefits of lead-acid batteries are not as strong, and frequent discharge can have a significant impact on battery life. Many chargers charge the battery at 97% to 99% after the indicator light changes to indicate full charge. Although charging only 1% to 3% of the battery has almost negligible impact on the driving ability, it can also lead to accumulation of under charging. Therefore, after the battery is fully charged, it is still advisable to continue floating charging as much as possible, which is also beneficial for suppressing battery vulcanization.

4. Timely charging

Timely charging can eliminate minor sulfurization. If not charged in time, these sulfurization crystals will accumulate and gradually form coarse crystals. Generally, chargers are powerless against these coarse crystals, which will gradually lead to a decrease in battery capacity and shorten battery life.

Editor's summary: That's all for how long it's best to charge lead-acid batteries and the maintenance methods for lead-acid batteries. I hope it's helpful to everyone. If you want to learn more about related knowledge, you can follow Qijia.com for information.

1. The environmental temperature has a significant impact on the battery. If the ambient temperature is too high, it will cause the battery to overcharge and produce gas. If the ambient temperature is too low, it will cause the battery to be undercharged, which will affect its service life. Therefore, the ambient temperature is generally required to be around 25 ℃, and the UPS float voltage value is also set according to this temperature. In practical applications, batteries are generally charged within the range of 5 ℃ to 35 ℃. Charging below 5 ℃ or above 35 ℃ will greatly reduce the battery capacity and shorten its service life.

2. The depth of discharge also has a significant impact on the service life of batteries. The deeper the discharge depth of a battery, the fewer times it can be cycled, so deep discharge should be avoided during use. Although UPS has a battery low potential protection function, generally when a single battery is discharged to around 10.5V, the UPS will automatically shut down. However, if the UPS is under light load discharge or no-load discharge, it can also cause deep discharge of the battery.

3. Batteries may lose some capacity due to self discharge during storage, transportation, and installation. Therefore, before being put into use after installation, the remaining capacity of the battery should be determined based on its open circuit voltage, and different methods should be used to supplement and charge the battery. For standby batteries that have been put on hold, they should be recharged every three months. The quality of the battery can be judged by measuring the open circuit voltage of the battery. Taking a 12V battery as an example, if the open circuit voltage is higher than 12.5V, it indicates that the battery still has more than 80% energy storage. If the open circuit voltage is lower than 12.5V, it should be immediately recharged. If the open circuit voltage is lower than 12V, it indicates that the battery stores less than 20% of electrical energy and is unusable.

4. Charging voltage. Due to the fact that UPS batteries are a backup mode of operation, the mains power is normally in a charging state and only discharges when there is a power outage. To extend the service life of the battery, UPS chargers are generally controlled by constant voltage and current limiting. After the battery is fully charged, it switches to a float charging state, with each float charging voltage set at around 13.6V. If the charging voltage is too high, it will cause the battery to overcharge, otherwise it will cause the battery to be undercharged. Abnormal charging voltage may be caused by incorrect battery configuration or charger failure. Therefore, when installing batteries, it is necessary to pay attention to the correctness of the specifications and quantities of batteries, and do not mix batteries of different specifications and batch numbers. Do not use inferior chargers with external chargers, and consider heat dissipation during installation. At present, in order to further improve battery life, advanced UPS adopts an ABM (Advanced Battery Management) three-stage intelligent battery management solution, which divides charging into three stages: initial charging, float charging, and rest. The first stage is constant current balanced charging, which charges the battery capacity to 90%; The second stage is float charging, which charges the battery capacity to 100% and then stops charging; The third stage is natural discharge, in which the battery uses its own leakage current to discharge until the specified lower voltage limit, and then repeats the above three stages. This method changes the previous way of keeping the battery in a 24-hour float state after being fully charged, thus extending the battery's lifespan.

5. Due to the use of an absorption electrolyte system, maintenance free batteries do not produce any gas during normal use. However, if the user uses them improperly and causes the battery to overcharge, gas will be generated. At this time, the internal pressure of the battery will increase, and the pressure valve on the battery will be pushed open, which can seriously cause the battery to burst.

6. The charging and discharging current of a battery is generally expressed in C, and the actual value of C is related to the battery capacity. For example, for a 100AH battery, C=100A. The optimal charging current for Panasonic lead-acid maintenance free batteries is around 0.1C, and the charging current cannot exceed 0.3C. Excessive or insufficient charging current can affect the battery's lifespan. The discharge current is generally required to be between 0.05C and 3C. UPS can meet this requirement during normal use, but unexpected situations such as battery short circuits should also be prevented.

7. During the operation of UPS, attention should be paid to monitoring the terminal voltage value, float charging current value, voltage value of each battery, ground resistance and insulation status of the battery pack and DC bus.

8. Do not separately increase or decrease the load of several individual batteries in the battery pack, as this will cause imbalance in the capacity of individual batteries and uneven charging, reducing the battery's service life.

9. Batteries should be installed in a clean, cool, ventilated, and dry place as much as possible, and should be protected from sunlight, heaters, or other radiating heat sources. The battery should be placed upright and not tilted at an angle. The terminal connections between each battery should be firm.

10. Regular maintenance. After a certain period of use, batteries should be regularly inspected, such as observing their appearance for abnormalities and measuring whether the voltage of each battery is average. If there is no power outage for a long time, the battery will remain in a charged state, which will reduce its activity. Therefore, even if there is no power outage, UPS needs to conduct regular discharge tests to keep the battery active. The discharge test can generally be conducted once every three months. The method is to load the UPS - preferably at 50% or more, and then disconnect the mains power to put the UPS in a battery discharge state. The discharge duration depends on the battery capacity, which is generally a few milliseconds to several tens of milliseconds. After discharge, restore the mains power supply and continue to charge the battery.

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