Anyang medical instrument factory supplies fans.

What you said should be normal. First of all, judging the quality of the battery is not how many lights your car turns on or off, but the capacity of the battery (rated current discharge time), that is, how many roads your battery can run until it is fully charged! Under normal circumstances, the continuous mileage of electric vehicles is around 40KM. As for the indicator light on the car, I can tell you that it will not be accurate, because it will not measure the capacity of the battery. The capacity of a battery can only be measured by two factors: discharge current and discharge time. That indicator light only measures the voltage of the battery, but the voltage of the battery does not indicate the quality and capacity of the battery. The old battery is seriously short of water, the internal acid density increases, the battery voltage increases, the acidity of the new battery is slightly lower, and the voltage is moderate (generally, the open circuit voltage is 12.38V/ piece), so the lamp goes out quickly when replacing the new battery. In fact, its continuous mileage will not be less. When the charger is plugged in, the sound is very loud, and it will decrease within half a minute. This is because there is a cooling fan (axial motor) in the charger. The quality of this kind of small fan used in most domestic electric vehicle battery chargers is very general, so the small fan will not be smooth for some days, so the sound is loud, and the running-in sound of the shaft will be small after a period of time. This is no problem. As for the date of the battery you mentioned, many small manufacturers have this phenomenon, because it is not order production, so manufacturers delay printing the date to prevent the battery from leaving the factory for a long time. As a result, the warranty period is approaching as soon as it leaves the factory, and customers don't want such batteries. In fact, this is good for our consumers, because our warranty period is actually extended. However, it is better to be careful about the batteries of this irregular manufacturer. I suggest you buy brand batteries such as Ultramicro Haibao Tianneng. Remember the most important point of lead-acid battery maintenance. Never short of electricity, charge when riding. I hope my answer can help you.