Yes, riding back to charge the electric car will hurt the battery, because the battery is still heating up at this time. In order to avoid spontaneous combustion explosion caused by charging, it needs to be cooled for more than half an hour before charging.

When the battery is 20% charged, it must be charged in time, because charging in the power-off state will also damage the battery. Of course, you don't have to charge it often, just once a day after riding. If you don't ride an electric car for a long time, it's best to charge it once or twice a month to keep the storage period of the battery, so as to avoid leaving it for too long after self-discharge. At present, most electric vehicle batteries are lead-acid batteries or lithium batteries, and the former can be charged when the power is less than 50%. After the green light, float for about two hours, and then unplug the power supply after it is fully charged. It should not be charged for too long. The latter means that the remaining 70% of the battery can be charged, that is, it can be charged immediately. After the charger turns green, you don't need to float, just unplug it, because after the lithium battery is fully charged, it has the function of protecting the circuit from cutting off the direct current. The service life of the battery is generally 2~3 years, but this is based on the condition that the maintenance is ok. If charging at will is not standardized, the battery may be scrapped in one year. The charging time is generally 6~8 hours, and the charger must be original. It is best not to use other fast-charging or different brands of chargers, but to buy them from regular stores.