Ok I got my Makita 18v battery back yesterday.

The first thing if you this route be prepared to take every cell out and resolder them, they come in a big brick form that wont fit in too many places.

They are 3000 mah packs alright but they are 2p. So there is 10 1500 mah cells in each pack.

To make a 6000 5s pack you will have 20 cells 5s 4p.

They fit nicely in an e maxx if you only use 4s 4p that is what I am going with.
They cells are easy to work with but a pain to take apart.