Selling these in pairs so that you can build a 10x3 battery pack. They can be disassembled as they are 2x3 and 3x3, giving you 2 sets of 5x3.
So, this kit allows you to build a 42v battery with 3 batteries in parallel. If you have batteries with a 3.4 capacity, it becomes a 42v 10.2ah.
I have 100 such packages and can sell all for 3000, which is very cheap as I am switching to other batteries. Contact me if you're interested in buying everything.