Why can't an electric scooter that has been left unused for a long time charge?

[Katherine]

Here are the reasons why an electric scooter cannot charge: 1. Mild sulfation: Balanced charging can be performed. You can perform general activation charging (i.e., balanced charging) on the battery, which usually lasts one to two days, and it can return to normal. 2. Severe sulfation: "Hydrotherapy" charge and discharge. It needs to undergo "hydrotherapy" charge and discharge to return to normal. The specific method is to first add pure water or dilute sulfuric acid with a density of 1.05g/cm3 to the battery until it reaches a flooded state, then charge it with a current of 0.05-0.018C2A for about 20 hours, drain the flowing liquid, and then conduct a capacity test. Repeat the above operation until the battery capacity is restored. 3. Extremely severe sulfation: Use a repair device. If the battery sulfation is very severe, ordinary repair methods will no longer work. You can use the high-resistance repair function of the repair device to increase the voltage to above 10V, then charge it again, and there is a certain probability that the battery can be reactivated.