A battery that has lost water can be repaired by adding water. The purpose of this method is to dilute the increased concentration of sulfuric acid so that the electrolytic reaction can proceed normally. The method of adding water is relatively simple: just open the top cover of the battery, where you will see six round holes. Inject a certain amount of distilled water into each of the six holes, and then soak the battery for at least 24 hours.
Only distilled water should be added to the battery. No other water, including purified water, should be added, because water with other components contains various metal molecules, which can easily cause self-discharge and damage the battery when added to it.
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Battery repair fluid for electric bicycles does have some use, but the repair effect is not good; it can only extend the lifespan for a period of time.
The repair effect on sealed valve-regulated lead-acid batteries within 3 years is very good. This is because after 1-2 years of use, lead-acid batteries experience water loss during charging, and over-discharge can cause lead sulfate crystals to form layers. Water loss makes them more prone to sulfation, leading to a decrease in capacity. In this case, adding a certain amount of distilled water to the sealed lead-acid battery and using a constant current, unrestricted voltage pulse desulfurization device is effective. Desulfurization takes a relatively long time, generally 1.5 to 2 times the charging time of a 0.2C charge. The battery temperature must be maintained at around 45 degrees Celsius and the voltage above 16V for a period of time to achieve the desired desulfurization effect. However, the temperature cannot be too high; cooling measures are necessary.
The batteries used in electric bicycles are generally lead-acid maintenance-free batteries. Their lifespan is calculated based on 300 complete charge-discharge cycles. These 300 cycles are calculated when the battery capacity drops to 75% of its nominal capacity. This data is important because users don't charge the battery when it only has 75% capacity; they only charge it when they have no other way to use it. At this point, the battery capacity has already dropped to 40% of its nominal capacity, which means it has been over-discharged. After discharging, the battery begins the sulfation process, and obvious sulfation will appear after 12 hours. Timely charging can remove minor sulfation.
Extended Information:
Battery repair fluid, also known as lead-acid battery repair fluid, battery activator, and battery capacity enhancer, is a solution added to failed electric vehicle batteries to restore their capacity, extend their lifespan, and improve their overall performance. It is simple and easy to use, requiring no specialized repair equipment. The effectiveness of the repair fluid varies depending on its composition.
After adding battery repair fluid, the battery capacity is restored after one complete charge and discharge cycle, and the range can be increased by 5-15 kilometers. After seven complete charge and discharge cycles, the battery capacity is restored to more than 90%, extending the service life by about one year. All batteries will experience various malfunctions and failures after reaching their certain lifespan limit.
Some failed batteries can be repaired by adding repair fluid, while others are so badly damaged that they must be scrapped. According to the national standard for electric vehicle batteries (Jb/T10262-2001), a battery with a capacity less than 70% of its nominal capacity is considered a failed battery.
