One thousand two hundred to one thousand eight hundred yuan.

The Haro electric car bought for 3,100 can be sold for 1,200 to 1,800 yuan at a car shop.

The price of a battery car worth 3,000 yuan depends on how long it has been used and how many kilometers it has been driven. If it is within 5,000 kilometers, then the maximum cost is 1,800 yuan.

If it is more than 5,000 kilometers, it will be about 1,200 yuan.