The problem with used laptop cells is that you need to test them individually for capacity before using them, which takes a long time. Often, they're worn out, which means that they charge up to 4.2v OK, but they have massive sag and go down very quickly. You only need one cell- group with bad cells in to ruin the performance of the battery. My advice is to make up a 6S jig and do a discharge test on every cell with a r/c charger like an Imax.
Also, the older type cells are relatively low on capacity for their weight compared with modern ones.
Having said all that, you can still make a useable battery out of recycled laptop cells if you have a supply of good ones and/or take your tome checking them.
Also, the older type cells are relatively low on capacity for their weight compared with modern ones.
Having said all that, you can still make a useable battery out of recycled laptop cells if you have a supply of good ones and/or take your tome checking them.