The quality of Huayan battery is very poor, the capacity is seriously substandard and it is not durable. I absolutely regret buying it. I am from Zhengzhou. In April, 20 12, I bought a set of 48v 14a colloidal batteries and a 350w electric bicycle in Amigues. At the time of purchase, the dealer said that my car can run 50 kilometers in summer and 40 kilometers in winter. When I first bought it, the battery could run 40 kilometers. I rode it for less than a month. Just after charging, the first battery went black one kilometer after going out. I went to the dealer to check that the battery was broken and changed a set of batteries. After riding for a month, the battery cruising range plummeted, directly losing nearly 10 km. When I arrived at the dealer, people were unhappy, saying that the battery was good and I didn't want to change it, so I left it alone. After riding the battery for half a year, I can only run less than 20 kilometers in winter. I went to the dealer again, and people began to cheat, saying that their brand-new battery ran 25 kilometers at most in winter, thinking it was after-sales fault, and called two people to grab my clothes and fight, but they were persuaded by the people next to them and didn't fight. Their battery is like this. I ride 20 days a month, 35 kilometers a day, and after riding for 8 months, the battery is scrapped and fully charged. When you go out, the first grid will be dark, and you won't need it after more than ten kilometers. I won't give it after sale. Everyone who uses this battery knows that this is a scam. The battery was broken, so I finally replaced it with Wei Chao's battery. I suggest you never buy it.