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After riding an electric bike for two or three years, the battery will run low. It will cost six to seven hundred yuan to go to a repair shop to replace the battery. Here I will teach you a trick: as long as you spend two or three yuan, your battery will be repaired as new. You just need to follow the following method to do it:

Firstly, prepare a screwdriver, an electrician's pliers, and a hair dryer (these things are usually available at home), and then spend two or three yuan to buy a bottle of battery water from a hardware store. Each bottle weighs about one pound, and these are all you need. Then, remove the battery and remember the wiring between the positive and negative terminals. Use a hair dryer to blow along the battery cover for a few minutes (as the battery cover is sealed with honey glue, blowing heat can soften the glue). Then, use a screwdriver to pry open the battery cover (at this time, the battery cover may break, it's okay, pry open). After opening the cover, you will see that the battery has six bottleneck covers. You use electrician pliers to open the six bottle caps and see a small opening. If you shine a flashlight inside, you can still see the lead bars inside the battery. Fill the battery water you just bought with a syringe, which is actually diluted sulfuric acid. If there is no syringe, open a small opening on the battery water bottle cap and insert a straw to add water. Fill all six openings. After filling up, cover the six caps, cover the battery caps, and seal the caps with adhesive tape. Clean the battery, install it back on the electric vehicle, and connect the wires according to the original route. And charge continuously for twelve hours. Start the electric vehicle, run out of battery power, use it without any electricity, and charge it for another twelve hours. In this way, your battery will look like new again and can be used for another two to three years.

Check the no-load voltage and load voltage of the battery. A good battery has a no-load voltage of around 13V and a load of 8-9V. A bad battery will have a very low load voltage.

Check the internal resistance of the battery. The internal resistance of this battery is generally around 10 milliohms. If the internal resistance is high, it indicates that it has been damaged

Add distilled water to the battery, depending on how much is missing. Remember not to add acid, as acid will not be lost,

Method/Step 2

Quiet for 10-30 minutes, repair with a repair device, start adjusting the voltage to 14V and current to 1-2A, then repair with 16.2V1A current. Until the specific gravity reaches 1.34-1.35

Batteries generally experience a decrease in capacity due to vulcanization. The reasons for vulcanization include prolonged high current discharge, low power conditions, and long-term exposure to low power or water shortage.

There are actually many repair methods, and you don't have professional repair equipment, so you can only add water for maintenance.

Both maintenance free dry batteries and water filled batteries require maintenance. Maintenance-free is not something that requires maintenance at all, it's just that maintenance is not very frequent.

Generally, battery repair is done through a battery repair device and battery repair solution. You don't have these, so you have to add water and perform simple maintenance. Water has requirements, and tap water, groundwater, and mineral water are not acceptable. Distilled water, deionized water, or high-purity water should be used.

Open the battery cover and remove the 6 safety helmets. As shown in the figure:

How to repair electric vehicle batteries.

Fill each well with distilled water using a syringe. If 1.28 standard electrolyte is added, the electrode plate may burn out due to high acid solubility. For example, when we eat hot pot, why does it become more salty as we eat it? That is to say, when water evaporates, salt does not evaporate through steam. Similarly, the acid in the battery does not evaporate, and what is missing is water. Therefore, we only need to add about 20-30ml of distilled water to each small hole. As shown in the figure:

How to repair electric vehicle batteries.

After filling up, let the battery stand still for half an hour, allowing the sponge around the electrode plate to fully absorb water. Then use a resistor to discharge all the electricity in the battery. If there is no resistance, a 12V light bulb can be used instead, such as motorcycle headlights and car turn signals, as long as it can discharge to 0V. How to determine if the battery is about to run out of battery? When the cement resistor discharges, the resistor body starts to heat up and gradually becomes less hot. At this point, the battery also runs out of battery. If it's a light bulb, it needs to be direct. As long as the light slowly stops turning on, it indicates that the battery has been discharged. The discharge time depends on the capacity of the battery at the time of discharge. We can ride the battery until it runs out of battery before maintenance, which can shorten the discharge time. As shown in the figure:

How to repair electric vehicle batteries.

After discharge, charge the battery. If possible, pulse charging can be used because pulse charging can effectively remove the sulfurization of the electrode plate and improve the battery capacity. If you don't have it, you can also use a car charger instead.

As shown in the figure: (Charging the battery) Taking pulse charging as an example below.

How to repair electric vehicle batteries.

After charging, use a syringe to remove excess water from each hole. There are a total of 6 holes, completed step by step. As shown in the figure:

How to repair electric vehicle batteries.

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