The 72120 lithium battery can be sold for about 360-420 yuan after two years of use
As you said, these are six 12v20 amp batteries. The initial price of lithium batteries is around 160-220 yuan each. Once recycled, they are purchased as scrap metal, regardless of the quality of the battery. In some places the price is 70 yuan each, and in others it is 60 yuan each.
If it is an electric car, it will be more cost-effective to replace the battery. It costs 600 yuan to replace six batteries. In total, the old battery costs nearly 100 yuan each.