What is the reason why the balance car cannot be charged and the light is always green?
2 Answers
This indicates that the internal lithium battery of the balance car is damaged, either due to excessive internal resistance or a short circuit in the lithium battery. In this state, the battery cannot be charged when connected to the charger, but the balance car can still operate using the power provided by the charger. At this point, the lithium battery board needs to be replaced. Below is the relevant explanation: Reasons for the light always showing green: Generally, a green light indicates sufficient battery charge, while a yellow light indicates the need for charging. It could also be due to a disconnected charging cable or a damaged charger. Another possibility is damage to the balance car's battery protection board. Important notes: The battery is the lifeblood of an electric balance car. If the battery performance is substandard, any impact or collision that causes a short circuit can lead to safety hazards such as explosions, fires, or combustion, turning the balance car under your feet into a real "wheel of fire."
My balance scooter has recently encountered the same issue—it shows a green light while charging, but the battery level doesn't increase at all. This problem is mostly related to the charging circuit or the battery itself. First, check if the charger has output voltage by using a multimeter to measure whether the plug's voltage is around the normal 42V. If the voltage is normal, the issue might be due to oxidation or poor contact at the charging port—try cleaning the metal contacts with an alcohol swab. If that doesn’t work, it’s likely that the battery protection board is locked, especially after long periods of inactivity or over-discharge. Last week, I opened mine up and found that some battery cells become unbalanced over time, triggering the protection. Another easily overlooked possibility is a faulty charger indicator—it might actually be charging, but the green light won’t change. In this case, try testing with a replacement charger. If all else fails, it’s safer to take it to a professional repair shop for inspection, as disassembling the battery yourself carries risks.
