Every time I go out in the past two days, I have seen the ** scrap vehicles at many intersections, which were rarely seen before, and can only be seen at the scrap collection station.
Especially the elderly in the community, after retirement idle no job, always want to find something to do, the community of garbage cans, as well as the discarded daily necessities in the corridor, have become the most interested target of the elderly, every time you go out to throw garbage, will be the paper shell out alone, saving the elderly to turn over the garbage.
The most of these old people are paper shells, as well as various bottles, some discarded children's toys, and some small household appliances, such as kettles, rice cookers, etc., after these things are broken, many families are directly thrown away.
In fact, these waste products are not very profitable, so I will share with you 3 very profitable second-hand projects. 1
Battery**. 
Now whether it is an electric car or a car have begun to electrify, battery technology is a trend in the future, every day during the rush hour, there are so many electric vehicles running on the road, the battery of each electric vehicle has a service life, some need to be replaced in one or two years, and a good battery can be used for three or five years.
Many repairers of electric vehicles will be the first old battery, after these batteries are in their hands, most of them are refurbished, and again, generally in the range of 50 to hundreds of yuan, if it is a lithium battery, it will be higher.
The elimination rate of electric vehicles is very high, although this life is getting richer and richer, most of the electric vehicles are a family's transition period, after the conditions, they will be replaced by cars, many electric car batteries are still very new, and eventually they are disposed of as waste.
There are also some merchants who will disassemble the old lithium battery, use the battery inside, refurbish the power bank, and then use the refurbished power bank as a new product**, I myself have a newly bought lithium battery, only used it two or three times after buying, and never used it again, bought it for 600 yuan, and finally sold it for 100 yuan.
Cell phone**. 
When mobile phones first became popular, we often saw people setting up stalls to collect old mobile phones on the streets, and until today, there are still people setting up stalls on the streets to collect old mobile phones, and it has developed into many communities. Now living in the city of the family, everyone is very independent, although they are all residents of a community, but also do not have much contact, the income level of people in a huge community is also very different, so that the price of mobile phones in everyone's hands is also high and low, high-income people discarded mobile phones, often have a high value.
The most common problem encountered by mobile phones is that the mobile phone screen is broken, or there is a problem with the mobile phone interface, and some mobile phone battery problems, these problems can be repaired, and they are the same as normal mobile phones after repair, but rich people encounter such problems, that is, they directly change their mobile phones.
People with low incomes, a mobile phone will be used until it can not be used, and rich people use mobile phones, called "playing machines", playing is an experience, experiencing the high configuration of the latest mobile phones, and experiencing the sense of technology brought by high-configuration mobile phones, especially young people with relatively high incomes, generally replace a mobile phone in two years.
A large number of abandoned mobile phones, after refurbishment, may only need to replace a new battery, a mobile phone case, or a mobile phone camera, these things are not valuable, refurbished and re-**, are half of the new mobile phone, 1000 yuan mobile phone 500 yuan is not fragrant, and such a mobile phone, you take it, there is no problem at all.
Computer**. 
Computers also have a very large profit margin, scrapped circuit boards contain **and**, which is also an important reason why many people use electronic circuit boards to refine ** to make money, but the most profitable is not this project.
Those who know how to repair the computer can reassemble and upgrade some damaged components, after reassembling, and upgrading the hardware, get it to the second-hand market**, these second-hand computers are also very popular, assuming that it takes three or four thousand yuan to buy a mainstream configuration of the computer, if you buy a second-hand computer, it only takes more than a thousand yuan.
When many families move, they will dispose of the old computer as garbage, a computer will be sold for 10 yuan, such a computer seems to have little value, in fact, after upgrading, it can still meet the needs of many people, even if it is not upgraded, after disassembly, the chassis, power supply, memory module, graphics card, network card are useful. So we often see that those who do computer maintenance generally use old computers, and after they get to them, they become a high-configuration computer through maintenance and replacement of accessories, or after upgrading again, and then package the whole machine again, which is a very profitable business.