Diggin up a super old thread…
Is your question about Cell recycling in general?
My personal opinion when it comes to esk8 battery for an esk8 you wish to ride reliably on a regular basis is to Invest in a quality pack.
Cheap hack together batteries projects can be dangerous for two reasons. Imagine your house burnt down and you loose all your sentimental belongings due to saving a couple buckz. Imagine it fails on you at you get stranded somewhere, or worse it casued a crash.
On the other hand, if you are primarily interested in learning about battery building and mostly want a project for educational purposes its worthwhile and can be fun.
Also note, if you dont already have all the tools you need it could turn out to be far from a cost effective battery build, however knowledge is priceless.